my 4.5" Severum seems to have a burn on its side is about .3" big not really that big but the heater does not work and is there for no reason so what could it be? any ideas? this happened one time a while ago as well but it goes away on its own and the severum acts normal with it theres also an oscar and a ghost knife fish + 2-3 baby firemouths my friend gave me he bred a pair 1" each