I read your other post too, and I think its a mantis, that you should get info on them, set up your 2 gallon, and go to the grocery store to get some shrimp food...
they are AWSOME!!! my lil guy has been out and about bigtime, and he is the most interesting fishy type thing i have ever seen... they're even interactive!!!
just throw in a piece of LR w/holes in it for him to live in, some snails and hermits for him to bash around (unless its a spearer, then you will have about 100 people asking you for it) and watch him have fun, fun FUN!!!!
(btw, I love my mantis)