wrote:
When he's floating he's pretty lifeless but when he swims he seems
quite normal. I'm worried that he isn't feeding as he isn't on the
bottom.

Fish can go without eating for a few days, don't worry about it.

I left the filter pump off overnight as he didn't seem to want to swim
against the current

That's not a good idea, as it allows oxygen depletion in the water
overnight.

Is there anything I can do for him or will the bouyancy disappear?

Perhaps treat the tank with Melafix to help him rebuild his slime coat?

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Victor M. Martinez
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