a couple of weeks ago one of my gouramies developed red sores with white fuzzy edges on the sides of its head. I treated it in my hospital tank with baktopur , pimafix, mellafix and salt. The sores seemed to heal well but the top of his head has developed a red area. it doesnt look like a sore its just gone red. In the hospital tank he often had his head wedged between the heater and the tank so im wondering if hes burnt it on the heater. he is eating and behaving as normal. i have attached a photo ( I know its poor but its the best I could get ) has anyone any ideas?, should I return him to the hospital or leave him in the main tank?