i guess both fish have it, but mor noticeable on the black tiger, best way to describe it is peeling sun burn. looks as though the slime coat is coming off, if i clean the tank it clears up then comes back. they have had for a while, seems to be more noticable since they layed eggs last week. the eggs are gone and i dont seen any babys btw.

photographs are very helpful where possible. Very important you do water test, ammonia, nitrite, nitrates and pH. Are wounds always in the same place?