I recently purchased two black moor goldfish [yesterday] and there have appeared to be no problems at all. But today, I noticed one of the fish is just sort of, floating around, almost like he's asleep, but not dead. And the minute you tap the side of the tank, he swims around again, no problem. The other black moor in the tank with him is absolutely fine, and is.. well.. hyper.. if fish can be hyper.
Any ideas what's up with him?
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