that's great to hear, i think that rays would be amazing animals to keep, and two should have a great life in there. i just get nervous when people start talking about cramming in tankloads of animals that basically HAVE to be imported from reefs. every ray/shark that dies in an aquarium due to bad husbandry is one more ray/shark that could have been living a long happy life on its reef. (i'll get off of my soap box now!)
hehe, i love thinking about what fish are feeling, what would make them more comfortable too! (i even do it with my corals and shrimps, since that's basically all i have right now!
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so, a concrete aquarium. will viewing be only from the top?