The best aquatic plant fertilisers, compared.
Top pick: Seachem Flourish 250 ml Best value: Easy-Life ProFito 1,000 ml – Lowest labelled weekly cost among nutrient bottles that print a dose, about £0.15 for 100 litres, at about £14.71. Updated October 2026.
Aquatic plant fertiliser on amazon.co.uk is a liquid you add to a freshwater aquarium so the plants can grow. You usually keep a tropical, coldwater or shrimp tank, and the bottle has to match nutrients the fish do not already supply. A complete feed adds nitrogen and phosphorus, a lite or trace feed does not, and liquid carbon is a carbon source rather than a fertiliser. Tell them apart by the nitrate and phosphate line, the dose, and whether the tank has strong light and injected. The listing says it contains no nitrates or phosphates, at 10 ml per 100 litres. Which type fits is set out in the [aquatic plant fertiliser buying guide](/hub/fertiliser-soil-and-bark-mulch/aquatic-plant-fertiliser/sub/aquatic-plant-fertiliser-buying-guide). A 4.6-star row does not mean the formula is complete.
Aquatic plant fertiliser on amazon.co.uk is a liquid you add to a freshwater aquarium so the plants can grow.
32 products checked · 54 hrs invested · +16,800 readers
Swipe for more
1-2 of 9
Personal buying guide
Question 1 of 2
What does the tank already have?
Seachem Flourish 250 ml is about £8.90 and 4.6 from 9,794 reviews, the largest file in this set. The listing says it provides micro and trace elements and does not contain significant nitrogen or phosphorus. The amazon bullets do not state a dose, a pipette or a shrimp claim. Three identifiers sit on the listing: model 001254, a bullet that says 020962, and manufacturer part 075233. Of 50 UK reviews, long-term users describe a small amount at each water change. One reviewer said the bottle comes up short of a full nutrient profile, which matches what the listing already says. Seachem's own page gives 5 ml per 250 litres once or twice a week and publishes 0.0001% copper. That dose is not printed on the amazon listing, and the copper figure is the maker's statement, not an independent UK lab test. It suits a tank that already has nitrogen and phosphorus from fish waste or separate bottles.
Pros
Cons
Best for: You already supply nitrogen and phosphorus from fish waste or separate bottles, and you want a widely reviewed trace liquid.
Less suitable: A high-light, low-fish tank if this would be your only fertiliser.
Specifications
Common questions
Does Flourish add nitrogen and phosphorus?
The listing says it does not contain significant levels of nitrogen or phosphorus. It says it provides micro elements, trace elements and other nutrients.
What dose does the amazon listing give?
Not stated on the amazon bullets. Seachem's dosing page gives 5 ml per 250 litres once or twice a week.
Which model number is on the listing?
The specification block says 001254. A bullet says 020962. The manufacturer part number is 075233. All three are on the listing.
Easy-Life ProFito 500 ml is about £9.49 and 4.6 from 5,196 reviews. The listing says the liquid contains no nitrates or phosphates and states 10 ml per 100 litres, without the words per week in the bullets. The maker's page uses that amount weekly. In a sample of 50 UK reviews, greener Amazon sword and Ludwigia within one to two weeks is a repeated comment, including when the weekly amount is split into smaller daily doses. The same sample includes a stiff cap, a bottle that arrived without the plastic seal ring, and one report of corydoras dying within an hour of each of two doses. That livestock report is a single review, not a measured cause. There is no pipette, and the bullets do not make a shrimp or fish claim. It is the top pick for a stocked, moderate-light tank. It is a poor fit if the tank tests near zero nitrate and needs nitrogen in the bottle.
Pros
Cons
Best for: A stocked, moderate-light tank where you want a widely reviewed liquid that does not add nitrate or phosphate.
Less suitable: A high-light tank that tests near zero nitrate and needs nitrogen in the bottle.
Specifications
Common questions
Does ProFito 500 ml contain nitrate or phosphate?
The listing says it contains no nitrates or phosphates.
How much does the listing say to add?
10 ml per 100 litres of water. How often is not printed in the bullets. The maker's page uses that amount once a week.
Does the listing say it is safe for fish?
Not stated. The bullets do not answer that question.
The 1,000 ml ProFito is the same no-nitrate, no-phosphate liquid at about £14.71, with 4.6 from 1,105 reviews. Thirty-four UK reviews describe growth over months of weekly use, and several say to allow two to three weeks. One reviewer pairs it with a separate nitrogen product after testing nitrate first. Others saw no change, or only a moderate change, until they raised the dose a little. One review describes 10 ml a day in a 100 litre tank with CO2, which is seven times the maker's weekly 10 ml per 100 litres. The item-weight line says 110 g, while the 500 ml listing says 540 g, so that figure is copied as printed. At the label amount this size is about £0.15 a week for 100 litres. It is the best value if you already like ProFito. The 110 g line is a reason to hesitate on a first bottle.
Pros
Cons
Best for: You already like ProFito on a stocked tank and want the lower price per 10 ml.
Less suitable: A first look at the brand if the 110 g weight line would stop you trusting the listing.
Specifications
Common questions
Does ProFito 1,000 ml contain nitrate or phosphate?
The listing says it contains no nitrates or phosphates.
How much does the listing say to add?
10 ml per 100 litres of water. The bullets do not say how often.
What is the listed item weight?
110 g. The 500 ml ProFito listing says 540 g, so this figure is copied as printed and not corrected.
AquaDesign CARBO 2,500 ml is a liquid carbon dose at about £19.99, with 4.6 from 71 reviews. The listing says 1 ml per 50 litres a day, with a maximum of 2 ml per 50 litres, and a 3 ml pipette is included. A bullet says it kills unwanted algae. Of 12 UK reviews, one keeper reported black hair algae clearing from leaves and bogwood over three years, and another saw no change after three months of buying it for that claim. Those reviews disagree, and this page does not treat the bullet as a result. One reviewer reported no effect on Amano shrimp. The model field says carb5L while the unit count is 2,500 ml. The active ingredient is not named, and the listing does not make a shrimp or fish claim. A 100 litre tank at the standard rate is 2 ml a day. That is a carbon habit, and iron and potassium still belong in a nutrient bottle.
Pros
Cons
Best for: You want a daily carbon dose in a tank that already has a nutrient bottle, and you will stay at or under the listed maximum.
Less suitable: Buying it as the only plant food, or buying it only to clear black beard algae.
Specifications
Common questions
How much CARBO does the listing say to add?
1 ml per 50 litres a day. The maximum on the listing is 2 ml per 50 litres a day. A 3 ml pipette is included.
Does the listing claim an effect on algae?
Yes. One bullet says it kills unwanted algae. That is the listing claim. Reviews in the file disagree, and this page does not confirm an authorisation.
Is the active ingredient named?
Not stated. The listing does not name the chemical.
AquaDesign PLANT+ 500 ml is a weekly all-in-one liquid at about £10.99, listed at 4.4 from 155 reviews. The dose on the listing is 10 ml per 30 litres a week, and a 3 ml pipette is included, so a 60 litre tank is about 20 ml. The bullets say it is safe for fish and for invertebrates, including shrimp. The short bullets do not state a nitrate or phosphate figure, although the title calls the bottle complete. Of 28 UK reviews read, several describe healthier plants, and others report little visible change. One reviewer described a surface film that got in the way of fish gulping air at the surface, and another found a small leak in the delivery bag. At the label rate a 100 litre tank uses about 33 ml a week, so this 500 ml fill is the shorter of the PLANT+ sizes.
Pros
Cons
Best for: You want a weekly all-in-one dose and you will measure it with the pipette.
Less suitable: A tank that already tests high for nitrate, or a buyer who needs the nitrate line printed in the short bullets.
Specifications
Common questions
How much PLANT+ 500 ml does the listing say to add?
The listing states 10 ml per 30 litres a week. A 3 ml pipette is included.
Does the listing say it is safe for shrimp?
Yes. The bullets say it is safe for all fish and invertebrates, including shrimp.
Can it be used in saltwater?
Not stated. The listing asks the question and does not give an answer.
The 2.5 litre PLANT+ keeps the 10 ml per 30 litres weekly dose and costs about £19.99, with 4.4 from 146 reviews. Twenty-nine UK reviews mention growth, including floating plants. A long-term user of another brand judged it no better at the recommended dose. Another said they had to add a lot before they saw an effect. Growth appeared inside the bottle after about a month in a dark cabinet, described as a white puff when it hit the water. The short bullets still leave nitrate and phosphate unstated, although the title calls the bottle complete. At about 33 ml a week for 100 litres the cost is about £0.27, which only helps if you finish the fill before it spoils. It suits a tank you already dose with PLANT+ every week. It is a poor fit for a nano tank.
Pros
Cons
Best for: You already dose PLANT+ every week on a tank large enough to finish 2.5 litres.
Less suitable: A nano tank, or a keeper who has not decided whether the tank needs added nitrate.
Specifications
Common questions
How much does the listing say to add?
10 ml per 30 litres a week. A 3 ml pipette is included.
Does the listing say it is safe for shrimp?
Yes. The bullets say it is safe for all fish and invertebrates, including shrimp.
Does the listing say it colours the water?
Not stated. One reviewer wrote that it does not colour the water. That is a review, not a specification.
The 2.5 litre PLANT LITE states nutrients without added nitrate or phosphate, dosed at 10 ml per 50 litres a week, at about £19.99. It is 4.4 from 19 reviews, and six UK texts were read. Reviewers describe plants thriving on a weekly dose, and one uses it beside CARBO while still preferring the original PLANT+. In a previously stable, heavily planted tank, one reviewer reported a large algae increase after starting it. Another measured phosphate off the scale after adding a drop to a jug of tank water. That jug result is one reviewer's test, not a laboratory assay, and it sits beside a phosphate-free claim. At 20 ml a week for 100 litres the cost is about £0.16. It suits a stocked tank if you will finish 2.5 litres and you want the nitrate-free line in writing.
Pros
Cons
Best for: You have a stocked tank, you want the nitrate-free line in writing, and you will use 2.5 litres.
Less suitable: A fast tank that tests near zero nitrate, or anyone treating one jug test as a lab result either way.
Specifications
Common questions
Does this bottle add nitrate and phosphate?
The listing says nutrients are added without added phosphates and nitrates.
How much does the listing say to add?
10 ml per 50 litres a week. A 3 ml pipette is included.
Does the listing say it is safe for shrimp?
Yes. The bullets say it is safe for all fish and invertebrates, including shrimp. That claim is not a copper test.
PLANT LITE 500 ml is the small bottle that says it adds nutrients without added nitrate or phosphate, at about £10.99 and 4.3 from nine reviews. The listing dose is 10 ml per 50 litres a week, and the same page also prints 1 pump per 6 litres a week, with a 3 ml pipette. The listing does not convert the pump into millilitres. Three UK reviews in the file are short and positive: good growth, chosen because it has no nitrate, and as advertised. No leak, cloudiness or livestock loss is written in those three texts. Nine reviews is a thin file beside ProFito's thousands, so the star row cannot carry a strong claim. It suits you if you want the nitrate-free line in 500 ml and you can accept a very small review file.
Pros
Cons
Best for: You want a stated nitrate-free liquid in a 500 ml bottle and you can accept a very small review file.
Less suitable: A high-light, low-nitrate tank, or a buyer who wants hundreds of reviews on this exact formula.
Specifications
Common questions
Does this bottle add nitrate and phosphate?
The listing says it is without added phosphates and nitrates.
How much does the listing say to add?
10 ml per 50 litres a week. It also states a pump-top dose of 1 pump per 6 litres a week. The pump is not converted to millilitres.
Does it come with a pipette?
Yes. The listing says a 3 ml pipette is included.
The 1,000 ml PLANT+ uses the same listing dose, 10 ml per 30 litres a week, and it is about £14.99 with 4.2 from 80 reviews, the lowest star row in this set. Sixteen UK reviews describe growth and brighter colour over several months, plus repeat purchases. The same file says the dose feels weak. One reviewer used five pumps a day on a 125 litre tank, and another found a pump marked 1 pump per 4 litres hard work on a 200 litre tank. That pump mark does not match 10 ml per 30 litres a week. One review mentions algae when the amount was not measured. The listing still includes a 3 ml pipette and the shrimp and fish claim. Measure millilitres rather than count unmarked pumps.
Pros
Cons
Best for: You already use PLANT+ and want a litre, and you will measure millilitres rather than count unmarked pumps.
Less suitable: A first bottle, or a large tank where you would be pumping 1 stroke per 4 litres.
Specifications
Common questions
What dose is printed in the bullets?
10 ml per 30 litres a week. Reviewers also report a pump marked 1 pump per 4 litres. Those two figures are both on the listing and are not the same.
Does the listing say it is safe for shrimp?
Yes. The bullets say it is safe for fish and invertebrates, including shrimp.
Is a pipette included?
The listing says a 3 ml pipette is included. Reviewers also describe a pump dispenser.
Nine amazon.co.uk listings were scored from the stored pages and the UK review notes already on file. Shelf date 19 October 2026. There is no laboratory test. A dose, a shrimp line or an algae line is the seller's claim. Where two figures on one listing disagree, both stay and the clash is a deduction. A 4.6-star row does not mean the bottle contains nitrate and phosphate. The highest score is the top pick. The best value is the lowest labelled weekly cost among nutrient bottles that print a dose, and it does not also take the top score. The weights below sum to 100.
Amazon evidence
25%Star rating on amazon.co.uk, then the size of that listing's review file. Flourish at 4.6 from 9,794 and ProFito 500 ml at 4.6 from 5,196 take the full block. PLANT LITE 500 ml is 4.3 from 9, so the file adds nothing here.
Listing clarity
35%A named type, an explicit nitrate and phosphate line or an explicit carbon job, a dose that includes how often, a pipette or pump, and a livestock claim the bullets actually make. A clash between two dose lines, or a missing nitrate figure, is a deduction.
Review outcome
20%Comments that describe plant growth at a stated habit score higher. A single livestock report, a surface film, growth inside the bottle, a split algae result, and a file of three texts are deductions. One report is not a measured cause.
Value
20%Pounds per week for a 100 litre tank at the dose printed on the listing, using the maker's weekly timing where the bullets give the amount and omit the week. Flourish has no dose on the amazon listing, so that weekly figure is not scored.
Buy the type before you buy the star line. A complete feed, a lite feed, a trace supplement and liquid carbon are not one list. Prices below are amazon.co.uk shelf prices on 19 October 2026. This is not a laboratory test.
Aquatic plant fertiliser on amazon.co.uk is a liquid you add to a freshwater aquarium so the plants can grow. UK shoppers usually keep a tropical, coldwater or shrimp tank. Quality is whether the bottle matches nutrients the fish do not already supply. A 4.6-star row does not mean the formula is complete. Four jobs sit in this set. A complete liquid is meant to include nitrate and phosphate as well as potassium, iron and traces.
Complete, lite, trace and liquid carbon do different jobs. A star line does not put them on one ladder. Match the nitrate line and the tank before you match the price.
AquaDesign bullets that say safe for shrimp are listing claims. Flourish's 0.0001% copper figure is the maker's published analysis, not an independent UK lab test.
CARBO is a daily carbon dose with a stated maximum. Reviews of the algae bullet disagree. Iron and potassium still need a nutrient bottle.
Name the job first. PLANT+ is the all-in-one, and the short amazon bullets do not print nitrate or phosphate even though the title says complete. ProFito and PLANT LITE state no added nitrate or phosphate. Flourish states no significant nitrogen or phosphorus and is a micro supplement, so macros are separate bottles. CARBO is liquid carbon, with a daily maximum, and a bullet that claims an effect on algae. That claim is not confirmed here as an authorised biocide use.
A dose you can measure beats a pump mark that does not convert to millilitres. ProFito is 10 ml per 100 litres, and the amazon bullets omit the week that the maker's page includes. PLANT+ is 10 ml per 30 litres a week. PLANT LITE is 10 ml per 50 litres a week. The 500 ml PLANT LITE listing also prints 1 pump per 6 litres a week. PLANT+ 1,000 ml reviewers describe 1 pump per 4 litres beside the weekly millilitre line. Those two figures are not the same.
Three typical situations, each with a recommendation from this comparison.
Fish waste already supplies nitrate and phosphate for any but the fastest plants, so a lite feed is the usual start. Easy-Life ProFito 500 ml is the top pick at about £9.49, with 4.6 from 5,196 reviews. The listing says no nitrates or phosphates, at 10 ml per 100 litres. There is no pipette.
A fast, high-light tank can run short of nitrate and phosphate. Flourish or ProFito alone will not fill that gap. AquaDesign PLANT+ 500 ml is the all-in-one to try, at about £10.99, dosed at 10 ml per 30 litres a week, with a 3 ml pipette. The short bullets still do not print a nitrate figure.
A shrimp-safe bullet is not a copper test. Seachem Flourish 250 ml publishes 0.0001% copper on the maker's site and says a massive overdose would be needed before that dose approached a level they regard as toxic. That is the maker's statement. The amazon bullets do not state a dose. It is about £8.90, with 4.6 from 9,794 reviews.
The top pick for a stocked, moderate-light tank is Easy-Life ProFito 500 ml at about £9.49. The listing says it contains no nitrates or phosphates, the amount is 10 ml per 100 litres, and amazon.co.uk shows 4.6 from 5,196 reviews. The best value is ProFito 1,000 ml at about £14.71, about £0.15 a week for 100 litres at the maker's weekly rate, with the item weight copied as 110 g. PLANT LITE states the nitrate-free line and a weekly millilitre dose. PLANT+ is the all-in-one, and the short bullets do not print nitrate or phosphate. Flourish is a trace supplement. CARBO is a daily carbon dose, not the nutrient bottle. None of these scores is a laboratory test.
Easy-Life ProFito 1,000 ml
Lowest labelled weekly cost among nutrient bottles that print a dose, about £0.15 for 100 litres, at about £14.71.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK and maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the nine amazon.co.uk listings captured on 19 October 2026. A shrimp-safe bullet is a listing claim. Flourish's copper figure is the maker's statement, not an independent UK lab test. CARBO's algae line is not confirmed here as an HSE authorisation.
Expert source (DIY & tools): Lee Burkhill (Garden Ninja) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
