. Sorry to hear you gave him away. I have been considering the same with some of my fish. I have an ~7" synodontis that has out grown his tank. Just like your Pleco, he should have been kept in minimum of a 4' long tank. I have mine in 3' 30gallon. He can swim from one side of the tank to the other in less than a second. He was a hybrid and was hoping he would stay in the 5" range.
Im going to my local local aquarium society later this week to see if someone wants some of my fish. The local group has a breeding contest this year where participants gain points for each species breed. Nothing beats obtaining a group of pepper Cories already primed for some easy points.