Last month I bought a 20 gallon tank from someone. It came with some fish and a 6 inch pleco. She called him an algae fish lol and told me that he just ate the algae. After doing lots of research, I figured out that my little guy (or girl) is a pleco. Since then I have tried to feed him 6 different typers of wafers, tons of vegetables and even a banana. He won't touch anything. I thought maybe it was the other fish bother him so I put up a divider and still won't touch the food. I've done the put it in and turn off all the lights for the night trick. That doesn't work. I have read that people have been able to drop a wafer into their plecos mouth. I can't get close to him. He swims away if I do. I'm not sure how to feed him. He stays in the same corner sucking the same areas of the tank so I'm not even sure how much algae he is gettng. He hasn't lost any weight. Any ideas on what I should do?