ATM Aquarium Products Colony Marine Nitrifying Bacteria 100 gal Cycle 32 oz

This is the only stuff I’ll use when starting a new tank or adding more fish. 10/10!

Isn’t as expensive as the others, and just as good if not better.

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Been in saltwater for 40 years, many claims by many products. This is the only one I've tried that really works. Bank on it !. New tank, recovering from copper dose, dead biostructure? quick and efficient

Followed the directions on the bottle and my tank was fully cycled when tested three days latter!

I was having an endless ammonia spike due to a container of food falling into the tank. killed my whole CUC and 3 fish, only 2 clowns remained alive through it, only because i was dosing with ammo-lock every 2 days in hopes of the biofilter eventually kicking in, well it didn't. i tried a couple of other nitrifying bacteria products and nothing worked, even after 50-75% water changes.finally, after my last water change, i dumped in a bottle of ATM, and within 2 days my ammonia dropped to about 4ppm, by the 5th day it was undetectible, i am finally in the final stage of the nitrogen cycle, and after my next water change, all my levels should be perfect. I highly recommend this product!

Worked well in cycling my new saltwater tank in no time. Added product then added 2 clownfish. They are still doing great and thriving after 2 months. Great product if want to cycle tank fast.

Great product but makes the protein skimmer flow over.