Thanks everybody. I'm going to get a new heater at work on wednesday. I'll post some more pics and a feeding video later.
@UKCATS - I got the mantis at the LFS that I work at. My manager likes to order things that people don't see very often(mappa puffers, blue devil groupers, octopus, gold flake angels, electric eels etc.) As soon as I saw that we had got him in I immediately put it on hold. Also I've never heard of one breaking a glass tank but i figured i didn't want to take the chance.