29G Biocube setup

[reefy]

I need some advice from you guys, currently I have my biocube for FWLR but I have decided that I am going for reef, I will take all my fishes back to the store tomorrow. currently the setup has a hang-on cpr2 refugium with skimmer and it also has a 9Watt coralife UV sterilizer and with bioballs in the second chamber. so here are my questions; for reef do I really need the bioballs; do I still need my cpr refugium-skimmer or the UV sterilizer?
how deep of a sandbed should I have currently 2 inches (planning to keep a blue-spoted Jawfish)
I am having a issue with the heat right now because of the 3 pumps that is in there now, its reaches up to 85F when the light is on. Can you guys tell me what I should do to run reef on my 29 gallon biocube e.i. do I have to upgrade my lighting? and how?
Thanks in advance!!!!