I'd also put the sols back in the race, if you ordered a single sol with all 70 degree optics (70/70 version) I think it would be plenty light for the tank. You'd probably want to mount it around 8" rather than 12" from the water but the spread should be fine for 24" x 24" area. Most people run these things at like 60% anyway so why not make the most of it and run one at closer to full power.
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