I have two tanks that we started in May 2020. One is 55 gallons, and one is 35 gallons. (Two daughters who have now left for school) I am having a terrible issue with the 35-gallon tank with brown algae. I have been battling it since August. Finally, about a month ago, I pulled out the live rocks and brushed the algae off, but it continues to grow back. I stay on top of brushing it off within the tank so it does not get long and take over everything but I am tired of it already. Here is some info on the tank. I do weekly water changes. Began at 10 %, then with the algae problem I increased it to 20-30% and one time 50%. I check my water parameters at least weekly. At one point my nitrates were high (80 ppm, ) which is why I did the 50% change. For the last month, my Nitrates have stayed at 10 ppm. I have a HOB Filter with 2 bio wheels. This last month I have now included a HOB Protein skimmer. I have two clowns and a pink basslet. I did have a lawnmower blenny but he died last week. I also have one Duncan, and two small colonies of Zoanthids. I have hermit crabs, snails, and I think a green emerald that I have not seen since I put him in the tank in May. My ammonia is always 0. Nitrites always 0. Calcium 440 -460, Salinity 1.025. and PH is 8.0 - 8.2. The temperature is around 78-80 degrees. And I have the Orbit LCD lights that I really have not learned how to operate. They are set with the default setting. (I think it is completely off from around 11:30 pm - 8:00 am.) I also have two powerheads on each end facing each other. I have a sand substrate and live rock. What am I missing??? I am becoming so frustrated. And I now also have both tanks with brown dusting all over my sand beds. The water stays crystal clear. Help!!