Myself, no...
I would only feed salt water shrimp once in a blue moon.
I feel like it is too fatty for them.
I keep my rays on a steady Diet of blackworms, earthworms, gut-loaded ghost shrimp and soon baby convict cichlids.
I am trying to replicate what they eat naturally. I also have a new breeding project of a different type of "feeder" for them that I will be divulging very soon.