Help! My adult angelfish who I've had for two years, is swimming around the tank quickly and turning constant somersaults, running into the driftwood, moving very quickly, can't seem to stop and stay in one place, or stay upright. Now she is laying down half sideways against the wood, and now swimming all crazy again. What could be causing this? Nothing has changed in the tank, and it just started happening tonight. Is it something treatable? I don't want to lose this fish! Any ideas?
