If I don't do a mantis shrimp I'm going to do a peaceful nano tank so I can keep small invertebrates that i've never seen before. I can see them up close too! (sexy dancer shrimp, banded coral shrimp and a fire shrimp if its possible) not all in one tank of course just one of those would do fine. with them I would probably do a pair of fish (clownfish) or nano fish nobody really keeps a lot. But if I can do a mantis shrimp then I would definitely go for it!