Photo's would be helpful if possible...
Are any of it's scales protruding? What colour is it's poo if you can tell that is as they are very timid fish is it acting normally swimming as normal, equilibreim is fine?
And I could be wrong but 110 gallons is to small...especially with 3 common plecs, 2 channel cats, black ghost knife, 4 bala sharks and 2 clown loaches ( group should be larger) plus a unknown Syno so it seems to me ( I am probably wrong but) seems overstocked so what are your water conditions??