You're dealing with enviromental compatibility as well as cohabitive compatibility.Originally Posted by Articman
Can your current catfish tolerate the heat for Discus?
The P.Ornatus temperature range is 24-25c, or 75-77f.
S.Decorus 22-28c or 71-82f.
Based on temp alone, I would say the Discus enviroment would not be hospitable to either species.
You're Pimeloid probably would not bother the Discus, in terms of aggression, but will compete for food on the bottom, and sometimes whiskers really bother other fish, even when the catfish inadvertantly brushes against them.