I would maybe try to do something invert focused, like a pair of sexy shrimp, or a boxer crab, or a mantis shrimp, really the possibilities are endless. with some easy low light corals. these tanks really are not hard if you have another large tank. they are a bit impractical if its your only tank, but also doable. I hade a half gallon nano with a mantis in it, but it would have been impossible if I hadnt had my other tanks.