mantis shrimp

[batfire]

My green mantis appears sick?? Water conditions are all in range. Nothing has changed, last night I saw him on his back. I nudged him and he swam off. This morning, on his back kind of curled up legs moving. Nudged again and he tried to swim but upside down then swam straight up the tank then down on his back. HELP !! He is so cool I hope he is not suffering.

[dskidmore]

How old is he?
How long have you had him?
What are your water parameters?
Any new introductions to the tank in the last month or so?
Any physical symptoms, or is it all behavioral?

I havn't seen much on invertabrate care; especially Manti, more often people are looking for advice on removing them. The basics should still apply though. Look at the enviroment, look at the organisim, find the abnormal part.