Seachem Stability 250 mL — Nitrifying bacteria for aquariums

Seachem Stability 250 mL is the compact format of the reference solution for quickly establishing a biological cycle in a marine or freshwater aquarium. Its patented formula contains a synergistic blend of aerobic, anaerobic, and facultative bacteria in spore form that facilitate the breakdown of organic waste, ammonia, nitrites, and nitrates as soon as they are activated in the water. Stability prevents new aquarium syndrome—the leading cause of fish mortality in captivity.

The 250 mL format is ideal for nano-aquariums, small to medium-sized aquariums, quarantine tanks, or as a reserve bottle to have on hand at all times for biological emergencies.

Spore Technology — Why Stability is Superior

The bacteria in Stability exist as spores —alive but metabolically dormant. In this state, they withstand extreme temperatures, require no food to survive, and maintain a lifespan of 6 years without refrigeration . Upon introduction into the aquarium, dilution in the water instantly activates the spores, which begin to colonize available surfaces—filter, substrate, live rock—within the first 24 hours.

Unlike competing products whose bacteria require very specific temperature, pH, and organic load conditions to survive, Stability strains function within a very wide range of conditions. Where other bacteria collapse under a high organic load, Stability becomes even more effective.

When to Use Seachem Stability 250 mL

Cycling a new nano or medium-sized aquarium

Add the product on day one and maintain it for 7 consecutive days. Fish and aquatic specimens can be introduced at any time during the dosing period—Stability is completely harmless to all aquatic life. For a fishless cycle, add a pinch of food daily to provide an ammonia source for the developing bacteria. Turn off UV and ozone for the duration of the cycle.

Added new specimens

Each introduction of new fish or corals suddenly increases the organic load. A dose of Stability with each addition prepares your biological filter to absorb this increase without causing a spike in ammonia or nitrites that are harmful to your existing specimens and the new arrivals.

After drug treatment

Antibiotics and antiparasitics destroy nitrifying bacteria along with pathogens. Administer Stability for 7 days after any treatment to quickly replenish your biological filter. Turn off UV and ozone at least 24 hours after each dose.

Regular maintenance

A monthly dose and with each water change keeps bacterial populations at peak efficiency, strengthening your system's resilience to accidental organic overloads.

Seachem Official Usage Protocol

• Shake well before use
• Turn off UV and ozone — for the entire 7-day cycle, or at least 24 hours for maintenance doses
• Day 1 — new aquarium: 5 mL (1 capful) per 40 litres
• Days 2 to 7: 5 mL per 80 liters, daily
• Maintenance: 5 mL per 80 litres — once a month, with each water change, when adding new specimens, or during medication treatment
• Shelf life: 6 years — no refrigeration required

Yield of the 250 mL format

• Aquatic cycling