Best Fish Tank Bacteria Treatment of 2025
Last updated on 20/09/2025
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Best Choice
1
envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres
envii
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envii
envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres
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Why we love it
- Crystal clear tank water.
- Safe for aquatic life.
- Improves fish health.
Main Highlights
- Clears Green & Murky Water in Fish Tanks – Aquarium Klear contains billions of beneficial bacteria to clean green & murky water in fish tanks for crystal clear water.
- Safe for All Fish & Aquatic Life – Containing only natural ingredients, our aquarium treatment is safe for all fish & aquatic life including.
- Reduces Filter & Tank Maintanence - Naturally removes excess fish waste, fish food & harmful toxins. This ensures your filters run efficiently meaning less cleaning, tank maintanence and happier fish.
- Easy to Use – With a built-in measuring chamber, each treatment can be accurately measured and used with ease. Simply add 5ml of Aquarium Klear per 40 litres of fish tank water. All dosage instructions are on the bottle.
- Treatments – 500ml bottle is enough to treat 4,000 litres of aquarium water. This gives you multiple treatments to last up to 12 months.
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Value for Money
2
Tetra AquaSafe to Turn Tap Water into Safe and Healthy Water for Fish and Plants, 500 ml
Tetra
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Tetra
Tetra AquaSafe to Turn Tap Water into Safe and Healthy Water for Fish and Plants, 500 ml
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Why we love it
- Reduces fish stress effectively.
- Protects fish skin & fins.
- Promotes bacteria settlement quickly.
Main Highlights
- Tetra AquaSafe makes tap water safe for fish and reliably protects fish and plants against harmful substances contained in the water
- Its optimized vitamin B mix reduces any stress that fish may experience during water changes and therefore sustainably supports their health
- Tailored to the special needs of fishes’ skin & fins; iodine supports vitality, magnesium promotes growth & well-being of fish & plants; natural plant extract protects fish gills & mucous membranes
- The care product encourages the settlement and bioactivity of useful bacteria in the aquarium, which in turn ensure clean, healthy water; it dissolves quickly in the aquarium water
- It is suitable for all freshwater & marine aquariums; when using Tetra AquaSafe in marine aquariums, however, the protein skimmer should be switched off to prevent large amounts of foam from forming
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3
AquaCare Bio Boost Filter Bacteria Booster For Freshwater Aquariums (240ml)
AquaCare
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AquaCare
AquaCare Bio Boost Filter Bacteria Booster For Freshwater Aquariums (240ml)
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Why we love it
- Releases beneficial bacteria quickly.
- Eliminates toxic ammonia effectively.
- Stabilizes aquarium environment safely.
Main Highlights
- ALL NATURAL BIOLOGICAL ENHANCER - Goes to work fast, releasing a large concentrated amount of beneficial bacteria that help establish a safe living condition for your fish. For use in both freshwater and saltwater aquariums.
- HIGHLY EFFECTIVE - Quickly eliminate toxic ammonia and nitrite, allowing you to add fish to your tank faster and lower the chances of initial fish loss.
- IDEAL USAGE - Apply Bio Boost to establish good bacteria strains or replenish them whenever they become depleted (after water changes, changing filter media etc.)
- BIO PROTECTION - Before bottling, a particular conditioning period places the nitrifying bacteria into a dormant state to ensure product stability.
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4
eSHa 2000 - Fungus, Finrot and Bacteria Treatment *Pack Of Two*
Ace Canine
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Ace Canine
eSHa 2000 - Fungus, Finrot and Bacteria Treatment *Pack Of Two*
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Why we love it
- Effective for fungus and bacteria.
- Two packs for value.
- Trusted brand for aquariums.
Main Highlights
- eSHa 2000 Fungus Finrot and Bacteria Treatment Pack Of Two
- Pet Supplies Fish Aquatic Pets Aquariums Accessories Water Treatments
- Product Type: AQUARIUM POND WATER TREATMENT
- Brand: eSha
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5
Tetra FilterActive Bacteria- mix of live starter bacteria & sludge-reducing cleaning bacteria, to support biological activity in aquarium, extend cleaning intervals & improve filter performance, 250ml
Tetra
32% OffFree Shipping
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Tetra
Tetra FilterActive Bacteria- mix of live starter bacteria & sludge-reducing cleaning bacteria, to support biological activity in aquarium, extend cleaning intervals & improve filter performance, 250ml
32% OffFree Shipping
Why we love it
- Accelerates pollutant degradation efficiently.
- Great value for money.
- Excellent product quality overall.
Main Highlights
- Accelerates degradation of pollutants like ammonia and nitrite
- Value for money
- Good product with good quality
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6
API Aquarium Antibacterial Remedy, Blue, 237 ml (Pack of 1)
API
38% OffFree Shipping
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API
API Aquarium Antibacterial Remedy, Blue, 237 ml (Pack of 1)
38% OffFree Shipping
Why we love it
- Heals infections, repairs fish damage.
- Rapid help with natural extracts.
- Preventive treatment for new fish.
Main Highlights
- Contains one (1) API MELAFIX Freshwater Fish Bacterial Infection Remedy 237 ml Bottle
- Heals bacterial infections and repairs damaged fins, ulcers and open wounds
- Contains natural, botanical tea tree extract to quickly and rapidly help fish
- Helps treat newly-introduced fish to reduce risk of disease outbreak in freshwater aquariums
- Use daily for a week when treating infections and for 3 days as a preventive when adding new fish
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7
Fluval Cycle and Aquaplus Water Treatment Pack, 250 ml
Fluval
12% OffFree Shipping
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Fluval
Fluval Cycle and Aquaplus Water Treatment Pack, 250 ml
12% OffFree Shipping
Why we love it
- Prevents fish loss effectively.
- Eliminates ammonia and nitrite.
- Safe for any aquarium.
Main Highlights
- Immediately establishes safe biological aquarium environment
- Powerful responsive ammonia and nitrite elimination
- Prevents fish loss
- Allows immediate introduction of fish
- For Fresh and Saltwater Use
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8
Starter bacteria aquarium – MICROBE-LIFT Nite-Out II 236 ml – ideal for tank cycling, water changes & fish stocking – reduces ammonia & nitrite fast – biologically active, safe & effective
ARKA
6% OffFree Shipping
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ARKA
Starter bacteria aquarium – MICROBE-LIFT Nite-Out II 236 ml – ideal for tank cycling, water changes & fish stocking – reduces ammonia & nitrite fast – biologically active, safe & effective
6% OffFree Shipping
Why we love it
- Instantly kickstarts aquarium biology.
- Removes toxic ammonia safely.
- Compatible with all aquariums.
Main Highlights
- Fast-acting starter bacteria with live cultures – immediately breaks down ammonia & nitrite – ideal for new aquariums, after treatments or adding new fish – supports biological stability from day one.
- Converts ammonia ➝ nitrite ➝ nitrate safely – prevents toxic spikes that harm fish & shrimp – keeps nitrogen cycle in balance – visibly clearer, healthier water with less stress for livestock.
- Purely biological & chemical-free – supports a robust filter bacteria base – trusted by aquarists for tank setups, restarts & maintenance – no refrigeration required, shelf-stable formula.
- Pairs perfectly with MICROBE-LIFT Special Blend – synergistic effect for lasting water clarity & reduced maintenance – ideal for planted tanks, shrimp tanks & reef systems.
- Developed by aquatic experts – premium biotechnology by MICROBE-LIFT – loved by breeders, aquascapers & marine keepers – Proven since 2011.
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9
Aquarium bacteria – Special Blend 118 ml – removes organic waste & reduces nitrate/nitrite – clear water & odour control – for freshwater & marine tanks – 100% natural biological solution
ARKA
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ARKA
Aquarium bacteria – Special Blend 118 ml – removes organic waste & reduces nitrate/nitrite – clear water & odour control – for freshwater & marine tanks – 100% natural biological solution
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Why we love it
- Promotes clear, fresh-smelling water.
- Boosts plant roots and coral vitality.
- Easy dosing and long-lasting effect.
Main Highlights
- Biological clean-up crew in a bottle – breaks down organic waste, sludge, uneaten food & plant debris – prevents surface scum – promotes clear, fresh-smelling water with less maintenance.
- Multi-stage bacteria chain – converts ammonia into nitrate & nitrogen – keeps toxin spikes under control – protects fish, shrimp & corals – ideal together with MICROBE-LIFT Nite-Out II.
- Stops protein & sulphur odours – photosynthetic strains stabilise oxygen levels – delivers crystal-clear, healthy water with natural shine – no chemicals or synthetic additives required.
- Boosts plant roots & coral vitality – enhances nutrient uptake, promotes root growth & polyp extension – brings out vivid colours in reef & aquascaping tanks – loved by experts since 2011.
- Easy dosing, long-lasting effect – 25 ml/100 L for first dose, 15 ml in weeks 2–4, then 7.5 ml biweekly – shelf-stable, no refrigeration – trusted formula by breeders, aquascapers & reefers.
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10
Evolution Aqua Pure Aquarium Waste Remover | 15 Ball Tub
Evolution Aqua
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Evolution Aqua
Evolution Aqua Pure Aquarium Waste Remover | 15 Ball Tub
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Why we love it
- Natural, chemical-free solution.
- Reduces filter and tank maintenance.
- Easy-to-use, innovative gel ball.
Main Highlights
- ✔ Natural, chemical free solution for a crystal clear, healthy aquarium – Pure Aquarium Waste Remover contains beneficial bacteria and natural enzymes that rapidly break down sludge and organic waste, leaving your aquarium clean and fish healthy.
- ✔ Reduces filter and tank maintenance – Naturally removes excess fish waste, fish food and toxins. Keeps your filters running efficiently and water fresh, meaning less gravel vacuum cleaning, tank maintenance and happier, less stressed fish.
- ✔ Easy to use, innovative gel ball – Keeps the live bacteria more effective and fresher for longer compared to liquid alternatives. The gel slowly dissolves over time so your fish tank is continuously supplied with beneficial bacteria.
- ✔ Safe for all fish and tanks – All natural ingredients only activate when needed and are safe to use in new or established aquariums. Beneficial aquarium bacteria also work as a nitrite remover and ammonia remover.
- ✔ Award winning product manufactured in the UK – Twice awarded Product of the Year by Practical Fishkeeping. Part of the Evolution Aqua award winning range of bacterial products for ponds, freshwater and marine aquariums.
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