Mantis in 55G

[Robudda]

Ok, search feature has been saying too busy for about 45 minutes so I will just shoot.

I had a 10 gallon sw tank a while ago, however I have always wanted a peacock Mantis.

So Here Goes I now have a 55G tank, However I think that is overkill just for one Mantis. Is there any fish that would do well with a Peacock in this size tank? I figured with the bigger tank they would have room to avoid each other. But hey been wrong before.

Also if I where to divide the tank and have 2 Mantis shrimps, would a fuge be mandatory, or can I get by with other filtration only?

Thanks,
Rob