I dont normally pay much close attention to our fish because my boyfriend does all of the upkeep and such since I work a lot, but i recently noticed this white patchy coloration on our pleco. I've briefly seen it before but he would always swim away when I tried to shine a light on him. I asked my boyfriend about it and he insists that it's normal. I've seen many big plecos close to ours size and never seen this on others. It's on his other side as well. Just couldn't post the picture.