Honestly, AI is the next best bet after Radions. I'm getting good PAR out of a Prime HD. For $250 each they are hard to beat! A Radion XR15 would cover 18" better than a Prime though. I have seen single Prime over the 24" IM 20 gallon tanks for LPS corals and though it looked spot light ish the corals did very well. What kind of corals are you trying to grow?
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~ Mindy
SPS fanatic.
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