My pleco can't stay stuck when he tries he falls backwards. I put him in a hospital tank. What do you think is wrong? I usually treat with salt. Can I use this for a pleco? I have heard different opinions. I want to do what is the safest. My readings in the main tank are ammonia 0, nitites 0, and nitrates 2ppm. He also looks a little skinny. I feed him wafers but the other fish eat them also. Can he just be weak?How do you keep the other fish from getting the wafers? 
