Mantis Shrimp with other fish

[fishmanty]

I have recently acquired a mantis shrimp, and Im trying to decide if I should try to keep him by himself, or with someone else. Currently he is in a 8gallon, but I have a 48gallon and a 50gallon that he could go into.

I need to know if a Mantis shrimp would be able to live in a 50gallon with my Undulated trigger.

Pretty much, if I can put him in a tank with other fish, what would be the best fish to keep with him, if I can't keep him with my trigger?