I am currently in the process of making my tank a reef tank. I have an odd shaped 5 sided corner tank that is 50 Gallons. My question is what is my next step? I already have the proper filtration system ( I used to have just the overflow filtration with a carbon bag ) I know I need light and that brings me to question 2. power compact vs metal halide? I think I want metal hailide but I don't want to worry about a chiller. After the light is here, what can I start to do to prepare for the corals? I am really new at reef tanks but not to saltwater. I also have a dog faced puffer, will he be OK with the corals? PLEASE HELP!!!!