Can anything be added to this?? Just something I think should be noted...
Often in stores you see stingrays with pelvic bones or spine showing. This is a malnourished ray. Rays should have a smooth top with a raised "lump" (for lack of a better word) in the middle where their organs and body structure are. Many people loose rays to underfeeding. The ray seems fine and then suddenly dies with no indication of why (if water parameters are correct) - this is from starvation. Rays eat ALOT!
A 8" ray can consume about 6-8 shell on shrimp, a chunk of fish, and a few mussels or scallops or other small meaty item daily (and then some). A cube of bloodworms simply won't do it.