Some of you may remember a few threads I made earlier this month on "nitrates" and "starting over". It's been one week now since the 100%change over of water to ro/di etc and the recycling process, and usually by now, hair algae would have completely taken over. I do have some, but nothing like before. I have installed my phosban reactor since and it seems to be working nicely. My only problem seems to be flow though. I turkey based my rocks after only 3 days and a lot of detrius came off of the rocks and after 6 days, I had a little bit of diatoms developing on my sand bed. Will this fuel the algae and cause it to grow (having detrius settling on my rocks)? There aren't any fish in the tank only a few hermits and coral banded shrimp, however my nitrates are still a little high (about 5-8 ppm), but not as much as before (20 ppm). Ammonia and nitrites are still zero. Should I keep my lights off for a few days or just let things run the course with the lights on on their normal cycle. I want to cut off all sources of food for the hair algae, but at the same time not jeopordize anything else going wrong. My tank does not have any corals in it as yet...Just live rock (110lbs in a 90 gal)and the coralline is growing nicely and I want it to continue. So are there any suggestions on what I should do? Any advice is always appreciated.