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A lot depends on what type of tank you plan on having LPS, fish only, mixed reef, or all sps corals. In general though I had AI sol super blues on my 7 x 2 x 31" tank 6 of them It was over kill. I know use 3 Hydras 52's. For a mixed tank the three should cove fine as long as you remember to keep the higher light corals towards the top and the lower light corals towards the bottom.
Mark
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