I've been getting for about 6-8 weeks brown hair like algae. It had grown very thick on the back glass and had bubbles coming off of it. Not as thick on the rock and sand. I got it off the back glass with a water change. I had since that water change done 20% water chage with ro/di and changed the filters every week, maybe missing a week. I changed my lights to 5 hour days and feed the fish 1 every 2 days. All test at the end of the week are good. Its a 55 gallon w/ 12 sump. Been set up for around 9 months and has 50 lbs of rock and 80 lbs of substrate. My next step was to buy new bulbs. They are only about 3-4 months old, t5's. I do have a clean up crew, but cant tell you how many of what. Snails fall and die from craps and craps kill craps. I lost count after the 1st day. Anything would help, just throw out stuff. Thanks.