I have a modified version and it seems to work like Steve says...
After corresponding with Steve and reading his site I created a wall of manono rock out of the light from my MHs and behind the reef, and directed a slow flow over it from my sump. Lots of what looks like chicken liver sponge (hows that for scientific nomenclature?) has formed and all my levels are NSW. Course, I do all the other fun stuff too-waterchanges, dosing ESV two part, yadda yadda yadda, so not exactly a controlled test. Flow rate over the manono is about 400 gph, and again, no light hits it.
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Current Tank Info: 3 reeftanks, fourth in the works
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