I don't believe so, but there are much more experienced users like OldFishLady who should be on tommorow at some point. But with a similar situation I was told to do daily 50% changes with extra dechlorinator. Like I said before, try to give him a more peaceful place to rest, too.
Also have you seen the leaf hammocks? You could make your own, but that's what I used on my fish that did the same thing and he rested on it so he could get to the air easily. So that might make whatevers got him down easier to deal with.
If the water changes are really difficult fo ryou toget to, maybe you should do a fish in cycle with your 2.5 gal?