i have about a 4 inch feather fin, if hes not by the heater hes up-side-down under the lip of my filter.. i went his side of the tank this morning and it looks like he has got burnt... he has about 2-3 places on his belly that are white where his skin use to be... he still likes to stay close to the heater,i was wondering if he is getting burnt wouldn't he have enough sense to move??
or is there a chance i might have another fish attacking him??

or is there a chance i might have another fish attacking him??