My old tank wasn't working properly so I had to quickly repot my fish into a brand new tank. I was nervous about putting all my fish in a brand new tank that hadn't been cycled yet. I followed directions, added bottles, then added fish. After two months all my fish are fine. I prefer to cycle my tanks naturally, but in a pinch or emergency this seems to work. The price was great too. Big pet stores take tons of this stuff.
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