tucker
Member
I had a slight hair algae problem and I also needed to paint the back of my fish tank black so I decided to take off all equipment including the light except the filter for 3 days. I turned back on the light and left it on for like 10 hours accidentally. I usually only have it on 6 hours a day. The next day I noticed one of my corals has a white spot on it also it seems like the outer edges seemed to have lighten up as well. Did I sun bleach it or is it some other disease or pest or some sort? Also my pulsating Xenia’s and green star polyps have been shrinking in size they are about the 1/4 of the size that they were a few months ago. Any ideas why this may be happening? All my levels are normal but my nitrates were like 20-30 but my phosphate is .03 ppm. I recently purchased a protein skimmer and rodi unit to help combat nitrates.