What tells you it's a peacock mantis? Got pic? Does it have the blue eye stalks and leopard spotting? Ive never heard of a peacock hitching before. usually, they burrow in the sand under the rocks. if it isnt a peacock, it simplifies things.
If it is really a peacock, at 2 inches it should be fine in a small tank. once it hits 5 inches though, you should have an upgrade ready for it. 5 inches is where it will be able to break glass. imo peacocks just get too big to be reef safe, but you could try it out. remember that a mantis is a messy eater. take that into account. I would keep away from an sps tank because peacocks are more deepwater and can develop shell rot more easily under really bright lights. For an adult peacock (6 inches or so) i recommend a 30 gal at least. acrylic is best, but you *can* get away with glass if you reinforce the bottom pane with strips of acrylic and beads of silicone.
fish is a maybe with mantids... test it out first to see if the mantis is tolerant of fish (they differ in personality greatly). to increase the chance of success, stick to fast fish that stick to the water column. damsel would be a good choice.
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