What's wrong with my gouramis?

[ronin]

Recently I lost a gold honey gourami and a red honey gourami to some weird disease (maybe) that I'm hoping someone can diagnose for me. Heck it might not even be a disease. But basically the fish stops swimming and just floats head-up (mouth on surface), initially at an angle but then more vertically as time goes on. Physically they seem ok and a water test shows 0 levels of ammonia, nitrites and nitrates. Is this some sort of swimming bladder problem? Anything I can do to combat it? Any info/suggestions greatly appreciated. Thanks!

 

[fishykisses]

it could be a swimbladder problem in which case maracyn might help.

 

[ronin]

it could be a swimbladder problem in which case maracyn might help.

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Yeah I just did a water change and put in a dose of Maracyn Plus, Melafix and Pimafix. Hopefully it'll save the one other gourami that seems to have the same problem.