Personally I have 3, 2 female marble motoro and 1 male retic, in a 375 (96×36×24) imo they'll eventually need bigger. The retics are going to be your smallest most widely found but can be touchy to keep alive, but no matter what any rays you choose are going to need alot of space, ALOT of filtration and an almost endless food supply. They're a great deal of work but well worth it.
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