| | Re: Floating,tail up!
A photo would be helpful if you can.
There may be several reasons it's hard to tell from the info you've given, but basically from my limited knowledge if he is in fact a she then she may be egg bound, on the other hand he may just need to pooh. if he's on gravel then he may have swolled some and be struggling to pass it, a spell in the fridge may help his bowls relax
it would be easier to tell from more info such as water parameters/ substrate size etc