I was soooo happy, in the past week or 2 coraline has finally starting growing places other than my LR. 2 of my powerhead have started with spots all over them, however after a few days/week the coraline turns white? Any idea what this may be from, I figured the tank was doing pretty well if the coraline was starting to spread? ammonia/nitrite are 0, have to run the rest of the test tonight or tomorrow after work but I can't imagine anything is real out or whack?