DescriptionTrusted by public aquariums around the world, Colony true nitrifying bacteria is the standard when it comes to establishing bio-filtration instantly. Before fish can be introduced into the aquarium, bio-filtration must be established to filter out the toxic ammonia and nitrite created by fish waste. ATM’s Colony establishes this bio-filtration in days instead of weeks with real, commercial grade nitrifying bacteria.Used by ATM, the #1 aquarium builders in the world, Colony contains real Nitrosomonas and Nitrobacter bacteria, which are specific for the freshwater environment.Key Features: Real Nitrifying Bacteria Establishes Instant Biofiltration Neutralizes Ammonia and Nitrite Spikes Naturally Two Different Formulas For Freshwater And Marine Systems Used By ATM!