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I probably would not in a tank that size with an already established melanurus, but that's just my opinion. I'd go with one of the smaller fairy wrasses, and maybe a possum wrasse.Question for the pros: I'm pretty sure I can BUT I have an H. Leucoxanthus and an H. Melanurus that will be in the tank. Should I consider adding another sand sleeper in a 35" x 21" x 21" tank?