Seachem Product Guide: Popular Products & Reviews

Seachem is a big name in the aquarium business. Their suite of products helps aquarists tailor their ecosystems to exacting standards. From chemical and biological filtration to fine-tuning your water chemistry, there’s a Seachem product that helps you meet your needs!

Seachem Prime Conditioner

Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
  • POWERFUL TREATMENT: Seachem Prime is a complete and concentrated conditioner for both freshwater and saltwater fish tanks, working hard to remove chlorine and chloramine.
  • REMOVER: Seachem Prime immediately and permanently removes chlorine and chloramine, successfully allowing the bio filter to remove ammonia, nitrite, and nitrate while they are detoxified for 48 hours.
  • DETOXIFIER: Seachem Prime effectively detoxifies ammonia, nitrite, and heavy metals found in the tap water at typical concentration levels, providing a ideal environment for your betta, tetra, or other fish.

Seachem Prime is one of the most advanced water conditioners on the market and combines dechlorination and heavy metal neutralizing with ammonia, nitrite, and nitrate detoxification! Prime even stimulates healthy fish slime coat production so they have a proper barrier to opportunistic infections.

An interesting aspect of Seachem Prime is that it detoxifies rather than outright removes ammonia, nitrite, and nitrate. Thus you may get a “false positive” when performing a test because technically the chemicals are still there.

They’ve simply been bound by Seachem Prime and are unable to interact biologically with aquarium fish and plants. Eventually the compounds are either taken up by nitrifying bacteria or removed once you perform a water change.

Pros of Seachem Prime:

  • Multifunctional – dechlorinates, neutralizes heavy metals, ammonia, nitrite, nitrate
  • Stimulates healthy fish slime coat
  • Works instantly when refilling during a water change

Of all the products here Seachem Prime is the one I’d want on hand at all times when doing aquarium maintenance. It rolls several functions into a single bottle yet is entirely safe for regular use.

Seachem Stability

Seachem Stability Fish Tank Stabilizer - For Freshwater and Marine Aquariums 500 ml
  • TANK STABILIZATION: Seachem Stability will rapidly and safely establish the aquarium biofilter in freshwater and marine systems, thereby preventing the #1 cause of fish death: "new tank syndrome".
  • TREATMENT: Stability is formulated specifically for the aquarium and contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite, and nitrate.
  • BACTERIA GROWTH: The necessary conditions for the growth of Stability's bacteria strains encompass a very broad range. When other bacteria begin to die off (usually from high organic loads caused by the unknown death of an organism), Stability simply becomes more effective.

Typically, cycling an aquarium is a process that can take weeks to months. However Seachem expedites this thanks to their Stability product, which contains all of the beneficial cycling bacteria needed to jump-start your ecosystem.

Seachem Stability is meant to eliminate the chances of New Tank Syndrome occurring, which is caused by ammonia/nitrite toxicity in an uncycled tank.

Ideally you’ll be using this product along with a proper colonization media like Seachem Matrix. The bacteria will seed the media over the course of a week and your aquarium can be considered fully cycled!

Unlike some other products the bacteria within Seachem Stability are in spore form. In this state they require neither food nor refrigeration until activated by entering the water. You’ll need to already have fish (or be performing a fishless cycle) for the bacteria to feed and cycle the aquarium!

Pros of Seachem Stability:

  • Guarantees a wide variety of beneficial bacteria
  • Fully cycles your aquarium in a week
  • Allows you reach full aquarium carrying capacity faster and with no animal stress

Since the usual method of adding a single fish per week is so slow I always use bacterial additives to reliably jump-start the process!

Seachem Purigen Ultimate Filtration

Seachem Purigen Organic Filtration Resin - Fresh and Saltwater 250ml
  • FILTRATION: Purigen ranges in color from almost white (cream) to light yellow. Seachem Purigen is not a mixture of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water.
  • SELECTIVITY: Seachem Purigen is an organic filtration resin that works hard to remove nitrogenous compounds and waste produced by fish, corals, and even plants, making your water crystal clear.
  • CAPACITY: Being both spherical and macroreticular, Seachem Purigen has microscopic pores that increase its usable surface area to many times that of a purely spherical resin.

Of all the various functions water changes provide, removing organic waste buildup is primary. This means not only leftover poop and traces of organic matter but ammonia, nitrite, and nitrate residues.

Seachem Purigen is a revolutionary product – a resin that has a high affinity for nitrogen-containing molecules. Since in the aquarium these are usually free-floating proteins and the remnants of the ammonia cycle, these problematic compounds are absorbed by the resin as it floats by.

Free floating essential minerals like salt and potassium go unabsorbed as they contain no nitrogen. Since it’s not an ion-exchange resin like most of the competitor brands Purigen won’t get clogged by these innocuous ions.

Over time, the media darkens as molecules build up. When that happens Purigen can be recharged using a 1:1 bleach to water mixture, followed by dechlorination following Seachem’s instructions.

Pros of Seachem Purigen:

  • Resin agent has high affinity for problem molecules but not beneficial/harmless ones
  • Porous structure for higher surface area
  • Reusable once fully loaded

Seachem Purigen is a reusable replacement for standard activated carbon/charcoal media and should take its place in a filter bag!

Seachem Matrix High Capacity Biofiltration

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Seachem Matrix Bio Media 1 Liter
  • Supports denitrifying bacteria
  • Extreme surface area
  • No need to replace ever

Seachem Matrix is an optimal substrate for beneficial nitrifying bacteria. According to Seachem each liter has a surface area of roughly 700 m2, which is an astounding area for a load of pellets around 10mm in diameter each! 

The pores are sized so all of the bacteria that manage the Nitrogen Cycle are present, from ammonia down to nitrate! And as an inert substrate Seachem Matrix never needs to be replaced or recharged.

Pros of Seachem Matrix:

  • Abundant surface area for bacterial colonies
  • Does not decay or break down
  • Can be used with most types of filtration

Some ceramic filter media offer similar surface area but don’t provide the tailored pore size of Seachem Matrix. However for canister filters with especially fast flow, you might be better served with ceramic cylinders with holes for better water flow throughout the media.

Seachem Equilibrium Mineral Balance & GH Water Treatment

Seachem Equilibrium 600gram
  • Ideal For Planted Aquariums
  • Restores Mineral Balance
  • No sodium chloride

Seachem Equilibrium is a specialty product meant to remineralize water that’s been treated for planted aquascapes, Caridina shrimp tanks, and other freshwater systems requiring exacting chemistry.

Many hardness additions also add KH (carbonate hardness) – together they affect both the pH and the CO2 carrying capacity of the water in negative ways. Seachem Equilibrium affects purely the GH content, adding potassium, calcium, magnesium, iron, and manganese to the system.

Be sure to measure your GH first before adding Seachem Equilibrium and only add more post-water changes. Like all dissolved metals the elements of Seachem Equilibrium don’t disappear as water evaporates; they grow more concentrated instead.

Pros of Seachem Equilibrium:

  • Provides essential minerals for plants, invertebrates, and fish without carbonates, salts, or phosphates.
  • Doesn’t evaporate out and comes in quantities that can last years at a time.

While it’s not a product for everybody I highly recommend Seachem Equilibrium if you keep species in need of GH control like shrimp and freshwater plants.

Seachem Flourish Planted Aquarium Supplement 

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Seachem Flourish Freshwater Plant Supplement - Aquarium Element and Nutrient Blend 500 ml
  • ENHANCER: Seachem Flourish Advance is an advanced formula contains phytohormones, minerals, and nutrients that dramatically stimulate the growth of both roots and shoots in aquatic plants.
  • GROWTH: The phytohormones play crucial roles in regulating plant growth in a wide range of developmental processes, including cell division, formation and activity of shoot meristems, induction of photosynthesis gene expression, leaf senescence, nutrient mobilization, seed germination, root growth and stress response.Refrigeration is recommended 3 months after opening
  • ADVANCED FORMULA: With regular use, Seachem Flourish Advance enhances mineral absorption and improves disease resistance. During the first ten to fourteen days after application, Flourish Advance works to stimulate root growth beneath the surface. After this initial induction period, significantly enhanced growth in the leaves and stems of the plants will occur.

Seachem Flourish provides iron, calcium, and other essential nutrients for plants in concentrations ideal for update. Other brands tend to provide everything, including nitrogen and potassium, all in a single blend. 

However, according to Seachem, this is suboptimal and can lead to overdoses of micronutrients despite good macronutrient levels.

Seachem actually makes several planted aquarium supplements and navigating the selection can be a bit confusing at first. In addition to Flourish they offer Nitrogen, Phosphorus, and Potassium-specific blends. Seachem Trace specializes in tiny doses of elements like Boron and Vanadium. And Seachem Flourish Advance provides phytohormones that boost plant growth. 

However for aquascapers looking for the widest selection of available nutrients, Flourish is the product you want to be using. Seachem even provides a product reference chart for which product is best as well as a Planted Aquarium Dosing Schedule!

Pros of Seachem Flourish:

  • Provides a balanced blend of micro and macronutrients
  • Phosphorus content is too low to spur algal growth
  • Pairs perfectly with their Flourish: Nitrogen, Phosphorus, and Potassium products

You may want to also use Seachem Flourish Tabs if your aquatic plants are heavy root feeders like many carpeting plants. However as an open water fertilizer Seachem Flourish has no equal!

Seachem Flourite Planted Aquarium Natural Substrate

Seachem Flourite Black Clay Gravel - Stable Porous Natural Planted Aquarium Substrate 15.4 lbs
  • GRAVEL: Seachem Flourite Black is a specially fracted stable porous clay gravel for the natural planted aquarium. Its appearance is best suited to planted aquaria, but may be used in any freshwater aquarium environment.
  • AQUARIUM BED: Gravel modifiers such as laterite are not necessary when using Seachem Flourite Black as this product is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels.
  • SET-UP: When adding water to the aquarium, fill slowly to avoid disturbing Flourite Black substrate bed. Place a bowl in the aquarium and add water directly to the bowl, allowing water to overflow softly on to the gravel bed. Initial cloudiness is normal, but to remove this simply use mechanical filtration

Clay gravels are some of the best planted aquarium substrates you can buy for an aquascape. They have a high cation exchange capacity (CEC) which allows them to absorb and retain beneficial compounds from the water column (such as Seachem Flourish). This way nutrients aren’t lost so easily to the filter and plant roots can eventually uptake these nutrients.

Seachem Flourite comes in both red and black, adding color contrast to the green of healthy plant growth. It has no effect on water chemistry but does cause some initial cloudiness that quickly fades within a few days.

Unlike some clay-based substrates Seachem Flourite won’t soften or lose its form over time. Nor does it lose its CEC – Seachem Flourite is good for the lifespan of your aquarium!

Pros of Seachem Flourite:

  • Latches onto free-floating nutrients for plants to uptake via roots
  • Good for the lifespan of your aquarium
  • Naturally and attractively colored

While it’s mostly nutrient-free Seachem Flourite does provide small amounts of iron as well. As a stable sponge for plant nutrients that encourages strong root growth Seachem Flourite is hard to match!

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