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I've just ordered one of these lights for a 93 rimless cube (30x30x24)... This tank will be SPS heavy, would I be okay with a single unit, or should I have two units?
Op is going sps heavy so a single xr30 let alone an xr15 is not going to happen. An xr15 covers 24x24 no problem if you are doing fish only.I suppose that depends on if you ordered the XR15 or the XR30. 1 XR15 will cover 24"x 24" very well and the XR30 will cover 30" x 30". I personally have 2 XR15w Pro's for my 65 gallon 48" long tank.

