What should I feed this guy? I think he was being fed prawns but I don't know how often. Can I just buy prawns from Safeway? What are other feeding options?

Thanks

Prawns will work. When I had mine, I fed it chopped up prawn about 1x per week. If I had some filleted snapper or something like that I would give it about a 1" square.

You could try mysis too and see how it likes it..

I also tried things like mussels and clams but found it would spit it out about 1/2 way digested after a few hours, so I stopped offering it those.