You guys amaze. I heard, or somehow got the impression that one pleco per tank was preferred. I've had two for a year and a half. Thanks for opening my eyes to the possibilities.
I used to own a Common Pleco and a Rhino Pleco, but both of them died within a few days of each other, I brought them inside from my outdoor pond in the fall, the rhino pleco then died from constipation/intestinal blockage and then the common pleco jumped out of the tank, only to get eaten by my dog .