Chemi Clean is awesome but just a word of warning. The directions have you turn off your skimmer and filter to use it. I had a 55 gallon with 5 fish in it and after turning off my skimmer and canister filter and just having one circulation pump I lost 4 of my 5 fish over night. At first I thought it was because of the chemi clean but now thinking it may have been due to a quick drop in oxygen? Just heads up if you don't have a sump or really good oxygen exchange, you may want to get an air stone or something.
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