Well I doubt its swim bladder. How long have you had the fish? COuld be stress from the tank crash. Have you done a really large water change? If not I would do as large of one as you can.
Look up "Brook" or "Brooklynella" (see sticky in this forum). Symptoms sound right and it's common in wild caught clownfish. Treat with Formalin or Malachite Green baths, maybe freshwater dips.
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