I've got a single IT2040 on my 24"x24"x18" depth 'cube' and it's doing fine. I have some SPS on the bottom and they're doing great at 50% on both channels. At 24" I doubt you would have any problems. I've read over at Reef Central that the par ratings are impressive even up to 30" and I'm a believer. I'll be posting a review here soon.
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20 year old Hagen 100g 6' mixed reef. 36g sump with multiple broken Waveline products removed. Lights T5-LED combo.
1 Coral Beauty, 1 Flame, 1 Blue Tang, 5 Green Chromis, 2 Pajama Cardinals, Asst'd hermits & snails.
2 large boxes of broken expensive aquarium crap. 1 x VERY understanding wife.
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