Have a couple myself. I took everything out of my 20g, dipped the rock in a bucket of fresh water to get the buggers out, found 1 Philippine Mantis, like a peacock, and then set everything back up. Yesterday I was very surprised to see a 2" Ciliated Mantis staring back at me as I watched my dwarf lion eating live brine shrimp!!! Where he hid during my tank cleaning out I have no idea, but he's there. On top of that, in two very small holes I saw a baby mantis in each!!! We're talking like two real scrawny guys at about 1/3" in length. Was very shocked at these discoveries, but don't mind too much. There is plenty of live food for them, from brine shrimp every other day to crabs barely big enough to see, up to 2"carapace guys, that I hope they all can co-exist and let the little guys grow up. There is a real nice Philippine in my 40g that has deliquently killed and eaten a crab every other day now for about 6 weeks. I have seen him once, nice looking fellow, at about 3". So...add me to the list of Mantis owners.