This is my first post.Firstable excuse my poor English. I have a 11 gal nano tank. All is fine , but my problem is because my corals turns brown. I make 1 gal water change weekly, my nitrates are 5, phosphates 10, ph 8.2, temp 80. I think the problem will be the leds I have in my nano. There are 12 cree leds (6 whites+ 6 blues) The whites are 6% power and my blues 25%. If I lower the percents they turned off. I only have two clowns , 8 months old aprox. My ricordeas are whites (before they were grees and orange, My duncan, some acans are brown. All of them are fine but the color is brown. I don't know what to do. Do you will help me with this situation? Thanks from Puerto Rico.