Did you get your G. chiragra from Rudy? He had a couple up for grabs recently, and I was tempted. I have no room for one, though...
RC.com has a whole mantis shrimp forum.
Try looking here for your answer:
http://reefcentral.com/forums/forumd...?s=&forumid=37
You'll probably find that it depends on your individual mantis if it'll be okay with fish.
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DC MEDICAL MARIJUANA