OK. I really appreciate all of the feedback everyone has submitted. The water I use is RO/DI/DI. I change 20 gallons a week. First pulling as much as possible of the algea out then siphoning. I have tested it many times and it is fine. SO that is not the problem. I only feed about once a week now but before was feeding every other day. I have a Prizm skimmer that seems to work well. I drip Kalkwasser 24/7. The lights have been replaced about 2 months ago, and are only on for about 8 hrs/day. The live rock is all Fiji. About 80 lbs or so. And I have a 2 1/2 - 4 inch sand bed. All Carib Sea Arigalive sand.



