I had a teacup lose an eye once. Not pretty. I've heard horror stories about torn disks, etc but I've also seen pics of a motoro in with a 5" festae. Hard to say how well that worked long term.
DO NOT DO it
i tried that with problems
if the ray is small they cichlids will stress it out and pick at is causing torn disks!
if the ray it bigger it might eat the cichlids!
DO NOT DO IT!!!!
Dovi kill everything so its out of the question
same with all the large cichlids
have you ever been bitten by a large aggresive cichlid? it leaves teethmarks and a nice bloody wound. then think howq soft a stingrays eye is! dont do it.