Nitrates are 0, maybe .25. Sometimes it's hard to read those test kits. For lights I have the coralife power compacts 50/50. 130 watts. The emporer I change the cartage once a month, the magnum as needed, about weekly.( I run it with the micron cartrage). I change 6 gallons a week and use R/O water and coralife salt. I do plan on buying kent salt next time. The algee is both green hair and brown. I need to clean the glass every other day, and I can stir up the sand to make it white, and 8 hours later, its turning brown again. The UV advertises algee control, not to mention every fish I've added in the last 2 months gets white spot and dies within a week. I pulled a blue tang and treated with copper, but he didn't make it. Any advise would be great.