Noticed your Sig, if your grouper has any size on it your ray could be lunch and triggers tend to injure eyes and tails of rays. Anemone's can sting-rays if they hover onto them. Now that that's out of the way, go with the Urobatis and your lfs
should be able to order them if they are worth their "salt ." Otherwise, Google "urobatis maculatus sale" and should get you some hits. If you must have the blue dot ray (lymma?) make sure it eats in front of you, such as pieces of shrimp, fish, mysis, earthworms, etc. Don't buy unless it eats as they can be a pain to force feed if your not used to it.