Hi, For the past couple of weeks I've had these white particles floating around the tank. They are elongated, look like small fibers or something. Did multiple water changes and they're still there, they won't filter out. I don't think they move or squiggle around as if they're alive or anything. 4 days ago the concentration seemed to have gone down a bit. I did a 50% water change, and they came back with a vengeance, in much higher concentration. The pics are what it looks like now. Fish are doing fine. Levels are 0, 0, 5. pH is 8. Any ideas what this is and how to clear it up?