ATM Colony Nitrifying Bacteria for Saltwater 16oz / 473ml (189 L / 50 Gal) Make no mistake about it. ATM Colony is theproduct that cycles aquariums instantly! Want your bio-filter immediately? Look no further than ATM Colony, used by the pros world wide. Neither seawater nor anaerobic bacteria will qualify is a surrogate to a concentrated true nitrifying bacteria culture like Colony.
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