Best Fluval Aquarium Water Treatments in 2026

Contains one (1) API STRESS COAT Aquarium Water Conditioner 1-Gallon Bottle

Makes tap water safe and protects fish with dual-action formula

Removes chemicals from tap water that are harmful to fish

Immediately establishes safe biological aquarium environment

Powerful responsive ammonia and nitrite elimination

Prevents fish loss

All-natural conditioner neutralizes metal toxins, chlorine and chloramine found in tap water

Herbal extracts reduce fish stress caused from transportation, handling and acclimatization

Coats delicate scales and fins to protect against minor abrasions

All in one micro-nutrient, iron enriched formula promotes vigorous growth, deep colors and a strong root system

Prevents mineral deficiencies and promotes disease resistance

Enriched with iron and fortified with an effective source of Vitamin B that is safe for fish and all aquarium inhabitants

Care for Your Habitat: All-natural water care reduces organic waste and overall tank maintenance by effectively cleaning interior surfaces. Treats up to 500 gallons of water.

Ideal for New Aquariums: Extremely effective when setting up a new aquarium or introducing new fish to an existing one and useful during water changes and filter media changes, when organic waste is building up.

All-Natural Care: Infused with Bio Scrubbers that breaks down waste and promotes clean water and living conditions.

Water Clarifier for freshwater aquariums

Traps floating particles

Safe for all aquarium inhabitants

Provides a naturally proportionate blend of calcium iodate and potassium iodide

Only naturally occurring iodine species are used at the proportion found in natural sea water

Does not contain any I2 (Lugol's Formula)

Reduces organic waste in betta aquariums

Helps reduce aquarium maintenance

Actively digests waste built up on gravel, power filters, decorations and interior surfaces

Clears organic debris

Controls new tank syndrome

Safe for all aquarium inhabitants

Replacement solution for the Fluval CO2 indicator set

Helps measure approximate CO2 levels in planted aquariums

Size: 10 ml (0.34 fl oz)

Mini Pressurized CO2 Kit for planted aquariums up to 15 gallons

Regulator valve effectively controls CO2 output

CO2 ceramic diffuser that efficiently dissolves CO2 in aquarium water

Supports Coral Growth & Naturally-Stable Marine Aquariums

Raises and maintains optimal levels of calcium, magnesium and strontium

Maintains Ionic Balance (Ca-Mg-Sr)

Biological Enhancer infused with a powerful team of beneficial bacteria that immediately inoculates aquarium water

Biological enhancer eliminates ammonia and nitrite

Water conditioner makes tap water safe for fish by neutralizing chlorine, chloramines and heavy metals

2 16.9-ounce bottles Fluval Water Conditioner

Highly efficient water conditioner makes tap water safe for fish

Use aquarium water conditioner whenever you change your tank's water