sick onyx

[Casshern]

I have a pair of rob's onyx and they've been very healthy for the last year. However, I noticed that my male seems to be having some problem swimming today. He seems to be having problems keeping balanced and swims vertically for the most part. His colors seem okay and he seems to be interested in food. Howevver, I'm still a little worried. Any help would be very much appreciated

 

[stykthyn]

what are the water parameters? perhaps he is just playing a game with himself. clowns love to do that.