Restless parrot fish

Advisable not to do 100% WC....high chance 1 of the reason ur fishes gasping for air...water parameters...best buy a spare tank smaller act as a hospital for them...seperate d sick n healthy fishes...coz u hav to really attend to d sick daily n every 3 days WC 30% no or reduce feeding...temperature 32C...ther are diff effect using normal n epson salt...same I put in normal salt b4 afew of my sick fishes floating at d top but when I use epson no problem...