how many times did it take to get rid of it? my powerheads are aquaclear 50's. any bigger would blow my sand around. i know this stuff won't harm my inhabitants, its just making my tank really ugly right now. what could be my problem? i reduced feedings to twice a week, heck i make those guys eat off the back wall most of the time. i just done a water change and i had cyano on the filter sponge on my skimmer, the filter intake and the intake on one of my powerheads. i had less problems when i didn't do changes so often. i change 10 gals every week now. i asked my LFS and he acted like it was my problem and didn't even answer, what gives?