lately 2 fish in my 55 gal. tank have been hanging around at the top of the tank tipping sideways occasionally, and one of them only has 1 pectoral fin so i figured he just needed rest time and cant hold himself upright all the time, but my oranda is fine, and he looks like hes really struggling to keep himself upright while swimming lately, and his tummy looks rather large. nothing else is physically wrong with him, and i fed them peas tonight, which he ate quite a few of. he is the resident piggy of the tank, eating more than his share of pellets.. should i fast the whole tank for a few days? or something else? any advice would be greatly appreciated

Fasting for a few days and a round of peas afterward
won't hurt at all. How are the nitrAtes in your
tank? If those are outta whack, that may contribute
to the problem as well.

How's the poo from your piggy fish?

I think it's just a swim bladder problum i had i fantail(it died) it had a swimmbladder problem from gulping too much air from the top of the tank. i kno it's not much of advise but that's all i got hope it helps !!

it could be a few things do you notice they do it wen you clean your gavel? if it is swim blader peas anf fasting will help so will soaking your pelets befor you feed it to your fish. also you could get a med that is eaten medigold is a vey popular brand.