I have a 72 gal acrylic community tank (see profile) and need some more help with algae. I already have a troop of 4 ottos which grew nice and plump after a couple months in the tank. I did some research on plecos and got advice to be careful because they rasp away at acrylic tanks, especially larger ones and can even rasp on other fish. But I know a guy that says pit bull plecos are great algae eaters and stay small. Would my acrylic tank be safe from disfiguration with a pit bull pleco?