Help! Mantis shrimp discovered!!

[Ryanerickson]

Originally Posted by Aquattro

How big is the thing? If it's the typical tiny little green or brown one, and there's nothing tiny like those little half inch fish, you could probably leave him. If it's a 6" beast, that could potentially kill things you'd prefer it didn't.

I've kept the little guys before, they eventually seem to vanish.

+1 on this I have kept little green mantis in my display it did not harm anything what colour is it? How big?