Oy, a mantis. How big is it? I spent three, maybe four hours catching mine with a turkey baster. Bandit, as I named him, for his white and black combination, now lives in a small disposable ziplock container with many holes in it. He seems to appreciate the snail shell I gave him to reside in. I feed him prime reef. The only problem now is that there is a mushroom living on the shell I gave him and I want the shell back. Good luck. I let Bandit live with my fish for about a month because he is very tiny and I couldn't catch him yet. I am just glad he left my $40 fish alone.