Seachem Stability 250ml / 8.5oz
Stability rapidly and safely establishes the aquarium biofilter in both freshwater and marine systems, preventing new tank syndrome—the leading cause of fish death. Formulated specifically for aquarium use, it contains a synergistic blend of aerobic, anaerobic, and facultative bacteria that help break down waste organics, ammonia, nitrite, and nitrate.
The bacteria in Stability are non-sulfur fixing and do not produce toxic hydrogen sulfide. It is completely safe for all aquatic organisms and plants, with no risk of overuse.
| Key Features |
|---|
| • Prevents new tank syndrome |
| • Contains aerobic, anaerobic, and facultative bacteria |
| • Safe for fish, invertebrates, and aquatic plants |
| • Non-sulfur fixing – no hydrogen sulfide production |
| • Suitable for freshwater and marine systems |
FAQ
How long does it take for Stability to establish a biofilter?
Stability typically begins to establish a functional biofilter within 24 to 72 hours when added to a new or recently cleaned aquarium.
Can Stability be used in both freshwater and marine tanks?
Yes, Stability is formulated for use in both freshwater and marine aquarium systems.
Is Stability safe for fish and plants?
Yes, Stability is completely harmless to all aquatic organisms and aquatic plants, and there is no risk of overuse.

Richard Wright –
I added Stability to my new freshwater tank after setting up the filter. Within a few days, my fish were active and water parameters stabilized. No ammonia spikes, which was a big relief. Easy to use and effective.
Alan Buckland –
My marine tank had high nitrite levels after cycling. I used Stability and noticed a significant improvement in water quality within a week. The fish showed no signs of stress.
Hannah Alsop –
It worked well in my 55-gallon tank. The bacteria established quickly, and I didn’t have to wait for a long cycling period. A reliable product for new tank setups.
Julia Wright –
Used it during a tank renovation. The water parameters stabilized within 48 hours. No fish died, and the filter started working properly right away.