I just setup a 20g tank with sand in my room. I haven'y ever gottena mantis shrimp before, but I like them so much that I decided to get one. First of all, is the Peacock Mantis Shrimp a spearer or smasher? I've heard that its spearer, smasher and both. Please someone help me out here and would i be able to keep a small cleanup crew in the tank, lets say some small hermits?