I am running 3 x 250w with lumenmax 3's on my 72x30x30 BB. My tank is SPS dominant and even the corals and clams on the very bottom of the tank are doing fine. You should be ok with 250's width and depth wise as the elite reflectors are bigger than the 3's. My only concern would be the length, with 90" to cover you might need to go with 4 x 250.
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