I have a frag that was given to me by a friend about 4 months ago of some Hot Pink Zoa's. They are my favorite. About a month ago I had a major algae problem. Green hair algae.. So anyways I have fixed that by getting the 29 Gallon Biocube skimmer made by sappire and getting rid of the bio-balls, adding more live sand and I was doing water changes twice a week for about 6 months. Prior to that I was doing a little less than a 10% water change weekly. I still cant explain why my nitrates went up so bad... I also added a bag of Purigen based on advice at my lfs.. All of my water levels are good now. My PH is about 8.3, Nitrates are around 20, calcium around 475, nitrites are 0, ammonia is 0 and phosphates are good. So my question is this.. When the algae got bad the pink zoo's closed up and haven't opened back up since. they still look nice a plump and seem like they want to open every now and then, they will peek out a little. There is a little algae on the polyp itself when it is closed and im not sure what to do. I have it under control now but you can still see where it was. I wish I could post a pic but don't have a good camera. I do have a pic in my gallery of my tank though. Sorry for the short story... any advice would be greatly appreciated. :mad2: