I have a 55 gal acrylic tank that I picked up off CL. Spent a lot of time buffing it to get back in decent shape & really hope not to have to do that again :icon_evil It's been running for awhile and needs some maintenance crew for algae control. I know plecos could scratch up the acrylic and am looking for some acrylic friendly/safe maintenance crew. Otos, nerites, etc.?