It looks like a Synodontis decorus. You may want to broswe through the Synodontis genus on planet catfish though.
I have 2 Synodontis eupterus with my bichirs. They are all abotu 6" at this point. So far all is well. I keep mine pretty well fed though, which can help prevent problems such as this. I would try it and if any problems do show up, be ready to deal with them.