Switch from CF to MH

[Dragonsteeth]

I have real space issues at the top of tank with two coralife fixtures and hang on skimmer and feed for phosban reactor. I was wanting to add a sump with overflow box and put my skimmer on the sump but don't have enough room for the overflow. So to get more space and some extra coral growth i was considering the MH. I agree about the heat issue.
Anyone know of a really small overflow box?