Kept just about all Synodontis species,Eupterus common names,Featherfin or Network are amongst the most aggressive.......a deffinite no no for me.If you want a nice peaceful species try the Clown syno,Synodontis decorus,these grow to approx 10inches,another is the Moustache catfish (Hemisynodontis membranaceus) great characters these,grow to 12inches generally and swim upside down most of the time...great cats!