Hello, Newbie here. The sides and face of this 6 year old pleco hasn't looked good for some time, years. It has white non raised white patches. Just looks like he's lost pigmentation or is missing the top dark layer of skin. Water parameters seem ok nitrites & nitrate are ok, ph is 6.8. The fish may be cold, he likes to hang out by the heater. Water temp is at 81 degrees. I don't see rapid breathing or lethargy. it's ~6" long and in a ten gallon tank. My pics won't add file is too large evidently, Sorry. I'll try figure that out and add later.