Depending on foot print of the tank, most of the 'common' benthic sharks would work: Bamboos (Brown banded, white spotted, Arabian), catsharks (Marbled or Coral) and eppaulettes.
For rays, I'd start with Cortez or Yellow. Both are fairly bullet proof. Avoid the various blue spots. They can be a pain to get eating and stress out quickly.
For rays, I'd start with Cortez or Yellow. Both are fairly bullet proof. Avoid the various blue spots. They can be a pain to get eating and stress out quickly.