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So I found out my bangaii and goby died so I did a check on my levels. My ammonia isn't 0!!!! However, my corals are doing fine. Setting up new saltwater right now
I'd test it again. It might be a small amount coming from the death of a fish rather than the cause of the fish's death. Either way, in a cycled tank you should never detect any ammonia or nitrites...so I'd suspect a mistest.