Hello... I have two fish. One blackmoor and one gold fish. They are a few years old and the gold fish is fine. The blackmoor however has decided to swim upside down.... its been doing this on and off for three weeks but i thought i would ask if any one knows why. I have tried not feeding them for four days on advice that it could be constpated... yes i know due to floating food and excess air intake thus pressing on its swim bladder.....no change..... any ideas or is my fish just mad....