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Hey guys, setting up a 135 gallon reef aquarium with 55 gallon sump/refugium. Gathering all my things together to start my process. I am glad I found this forum, at least I know most of you are close by. I will have many questions to ask as I go through my build. I have a metal halide system that I will be hanging about 15' above the tank. For what I am going to be growing I dont think it needs to be much higher and I have heard stories of people putting MH to close to their tanks.