I recently got a 10ish inch tiger oscar and he has a couple areas on his head that I am concerned about. He has a couple of areas, that aren't really holes or pits, but almost look like a velvet covering which I have heard is an early sign of future hole sites. He is in a 55 gallon with an emperor 400 for filtration. water params are 0 across except nitrates which sit right above 10. No tankmates. I have had him for 2ish days so I am sure this is something that was caused by his previous tank. I have General cure (250 mg metronidazole and 75 mg praziquantel per 10 gallon packet) but I want to know for sure before I begin the dosing process. I have attached a pic and hope that someone can help me shed some light on the situation. Oh the rub mark on his lip is from a log in his previous tank and it is already looking better. 




