Do you think it could damage my Liearus or is it safe to just continue feeding the clams?

I've recently started feeding my rays whole clams in their shell, more to give them something more interesting at meal times than cooked and peeled prawns or whitebait than anything else. The trouble is they share a tank with a 20" Liearius pictus which has decided it likes the clams too, it sw...

I would certainly be thinking of seperating them in the future, Calophysus have some serious hardware in their jaws and a large specimin could reduce the other cat to nothing but a head in a very short time.