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Seachem Products

The world's most trusted name in aquarium water treatment, plant nutrition, and filtration media.

39 products

conditioners

Seachem Prime

The complete and concentrated conditioner for both freshwater and saltwater. Prime removes chlorine, chloramine and ammonia, detoxifies nitrite and nitrate, and provides essential slime coat protection. One capful treats 50 gallons.

100 mL250 mL500 mL1 L+2

conditioners

Seachem Stability

Stability rapidly and safely establishes the aquarium biofilter in freshwater and marine systems, preventing the 'new tank syndrome.' Contains synergistic blend of aerobic, anaerobic, and facultative bacteria for complete biological filtration.

50 mL100 mL250 mL500 mL+2

plant supplements

Seachem Flourish

A comprehensive plant supplement for the planted aquarium. Flourish provides a broad spectrum of essential micro elements, trace elements, and other nutrients including calcium, magnesium, iron, and vitamins.

100 mL250 mL500 mL2 L+1

plant supplements

Seachem Flourish Advance

An advanced phytohormone supplement for planted aquariums. Flourish Advance contains phytohormones, minerals, and nutrients that dramatically stimulate the growth of both roots and shoots in aquatic plants.

100 mL250 mL500 mL2 L

plant supplements

Seachem Flourish Excel

A source of bioavailable organic carbon for the planted aquarium. Flourish Excel provides an alternative carbon source for plants that cannot use CO₂ injection. Also effective against many types of algae.

100 mL250 mL500 mL1 L+2

plant supplements

Seachem Flourish Iron

A highly concentrated ferrous iron gluconate supplement for the planted aquarium. Iron is critical for plant photosynthesis and chlorophyll production. Flourish Iron provides the most bioavailable form of iron.

100 mL250 mL500 mL

plant supplements

Seachem Flourish Tabs

Gravel bed supplement tablets for the planted aquarium. Flourish Tabs establish a nutrient-rich substrate to promote strong root development and lush plant growth. Ideal for root-feeding plants like Amazon Swords and Cryptocorynes.

10 tabs40 tabs

plant supplements

Seachem Flourish Nitrogen

A concentrated nitrogen source for the planted aquarium. Provides nitrogen in both nitrate and ammonium forms, allowing plants to choose the most efficient uptake pathway based on their needs.

100 mL250 mL500 mL2 L

plant supplements

Seachem Flourish Phosphorus

A safe solution of potassium phosphate for the planted aquarium. Phosphorus is one of the three essential macronutrients (NPK) and is often the limiting factor in plant growth.

100 mL250 mL500 mL

plant supplements

Seachem Flourish Potassium

A concentrated potassium supplement for the planted aquarium. Potassium is essential for protein synthesis and photosynthesis. Deficiency causes yellowing and pin holes in leaves.

100 mL250 mL500 mL

substrates

Seachem Flourite

A specially fracted stable porous clay gravel designed for the natural planted aquarium. Flourite is most effective when used alone as an integral substrate bed, but it can be mixed with other gravels. It is not chemically coated or treated.

3.5 kg7 kg

substrates

Seachem Flourite Black

The premium black clay substrate for planted aquariums. Flourite Black provides the same excellent nutrient content as regular Flourite with a striking dark aesthetic that enhances plant coloration.

3.5 kg7 kg

substrates

Seachem Flourite Black Sand

A specially graded fine black sand substrate for planted aquariums. Ideal for creating natural-looking carpeted aquascapes and perfect for bottom-dwelling species like Corydoras.

3.5 kg7 kg

filter media

Seachem Purigen

A premium synthetic polymer that removes soluble and insoluble impurities from water at a rate and capacity that exceeds all other competing products. Purigen controls ammonia, nitrites, and nitrates. It is regenerable, making it extremely economical.

100 mL250 mL500 mL1 L+1

filter media

Seachem Matrix

A high porosity biomedia that provides a massive surface area (~700 m²/L) for both aerobic and anaerobic bacteria colonization. Matrix's internal pore structure is ideal for denitrifying bacteria that reduce nitrate.

250 mL500 mL1 L2 L+1

freshwater

Seachem Acid Buffer

A non-phosphate buffer to lower pH and buffer to the acidic range (5.0–8.0). Acid Buffer is designed to be used in conjunction with Alkaline Buffer to achieve a target pH when testing waters.

70 g300 g600 g1.2 kg

freshwater

Seachem Discus Buffer

Adjusts pH to the acidic range (5.8–6.8) and softens water by precipitating calcium and magnesium. Discus Buffer is designed specifically for the needs of discus and other soft-water South American species.

50 g250 g500 g1 kg

medications

Seachem ParaGuard

The only fish and filter safe aldehyde-based medication. ParaGuard is effective against external parasites, fungi, and bacterial infections. Unlike many medications, it does not adversely impact the biofilter.

100 mL250 mL500 mL1 L+2

conditioners

Seachem StressGuard

A premium slime coat protection and stress reducer. StressGuard binds to exposed protein in wounds and lesions, providing a protein-based bandage that promotes healing while reducing susceptibility to disease.

100 mL250 mL500 mL1 L

plant supplements

Seachem Equilibrium

A mineral supplement designed to establish proper GH (general hardness) in the planted aquarium using RO/DI or very soft water. Contains calcium, magnesium, potassium, iron, and manganese — the essential minerals for healthy plant growth.

300 g600 g

freshwater

Seachem Alkaline Buffer

A non-phosphate buffer to raise pH and alkalinity (KH). Designed to be used with Acid Buffer to achieve a precise and stable target pH for any freshwater aquarium.

70 g300 g600 g1.2 kg

freshwater

Seachem Neutral Regulator

Adjusts pH to neutral (7.0) from either a low or high pH. It softens water by precipitating calcium and magnesium while simultaneously removing chlorine, chloramine, and ammonia.

50 g250 g500 g1 kg

conditioners

Seachem AmGuard

Rapidly removes ammonia, chloramine, and chlorine. Detoxifies on contact, making water instantly safe for fish.

100ml250ml500ml1L+1

conditioners

Seachem Safe

Concentrated dry powder dechlorinator. Same formula as Prime in powdered form — removes chlorine, chloramine, and detoxifies ammonia, nitrite, and nitrate.

50g250g1kg

conditioners

Seachem Replenish

Restores and maintains general hardness (GH) in purified water. Adds essential minerals for fish health.

250ml500ml2L4L

conditioners

Seachem Clarity

Advanced water clarifier that rapidly clears cloudy water by clumping fine particulates for easy removal by mechanical filtration.

250ml500ml2L4L

conditioners

Seachem Pristine

Natural bio-organic waste management. Uses biologically active bacteria to break down sludge, detritus, and uneaten food.

100ml250ml500ml2L

filter media

Seachem de*nitrate

Porous media for biofiltration that removes nitrates, nitrites, ammonia, and organics. Anaerobic denitrification at low flow rates.

250ml500ml1L2L+1

filter media

Seachem MatrixCarbon

Premium spherical activated carbon. Superior capacity for organic contaminants and discoloring compounds. Minimal impact on trace elements.

100ml250ml500ml1L+1

filter media

Seachem PhosGuard

Rapidly removes silicate and phosphate from marine and freshwater. Helps control algae by eliminating key nutrients.

100ml250ml500ml1L+1

filter media

Seachem PhosBond

Dual action GFO and aluminum oxide blend for superior phosphate and silicate removal. Long-lasting and highly effective.

100ml250ml500ml1L

filter media

Seachem Renew

Broad-spectrum resin designed for general organic waste removal. Regenerable and reusable for long-term value.

100ml250ml500ml1L

filter media

Seachem SeaGel

Combination of Matrix Carbon and PhosGuard for dual chemical filtration. Removes organics, phosphate, and silicate simultaneously.

100ml250ml500ml1L

medications

Seachem Cupramine

Buffered copper treatment for external parasites including ich, velvet, and brooklynella. Safer than copper sulfate formulas.

100ml250ml500ml

medications

Seachem KanaPlex

Kanamycin-based treatment for gram-negative and gram-positive bacterial infections, including dropsy, popeye, and fin/tail rot.

medications

Seachem MetroPlex

Metronidazole treatment for internal and external protozoan and anaerobic bacterial diseases including hexamita and hole-in-the-head.

medications

Seachem NeoPlex

Neomycin sulfate treatment for gram-negative bacterial infections. Effective against a wide range of external infections.

10g

medications

Seachem Focus

Antibacterial polymer binding agent. Used with other medications to deliver them via food, ensuring fish ingest the treatment.

medications

Seachem PolyGuard

All-in-one parasite, fungal, and bacterial treatment. Broad-spectrum defense for multiple fish diseases simultaneously.

10g