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I have an 8 year old Cory catfish that I recently moved to a new tank after spending years in the old one. It’s been about 3 days and I’ve been feeding the other fish regularly but the Cory comes out of its hiding spot very rarely. Then today it suddenly rocketed out of its hiding spot and swam around in circles before going limp and falling to the floor of the tank. It’s still breathing and moving but it’s acting strangely. None of the other fish in the tank are acting weird. What could be the cause?