The lighting you have is what I would consider low - med. 150 watt MH will not have the necessary depth penetration for more than about 18" for some corals so it all depends on what you want to keep. Rics, zoos, soft corals, LPS and a few sps will do great. Most sps will still grow well and stay healthy with that lighting but they will not likely have the vibrant colours they would have in stronger light. What have you got for flow as that is easily as important as the lighting for many corals?
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Greg
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