Mantis Shrimp Food?

[krissyfish20]

Yeah he's in a separate tank right now. It's a 2 gallon eclipse and he has a few pieces of live rock. I don't really know what else to put in with him, but I'm assuming not too much else. I wasn't sure if I wanted to keep him at first, but I think I'm going to keep him after all. I'm not sure how big this little guy is going to grow, so I might have to put him in a larger tank as he grows. A friend of mine said that this might be a type of mantis that grows only to about 1 - 2 inches, so he may be full grown. I don't know much about mantis so I'm not sure. He looks kinda navy blue/dark grey with a light limey-green coloured tail.