The only algae I've seen from low water movment is diatomatious algae and or red algae. Green algaes grow well in strong current. Curing rock with the lights off to me is a waste of time but if it works for you that's great. I've seen people do things that make no sense to me and sometimes I do things that makes no sense to someone else but we do stick with what works for us regardless of what others say. Look at one of the guys here he doesn't do water changes etc but he's got a nice tank... who knows what goes on.
Doug
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