The bulbs are actually pretty new, bought in april. So i haven't been looking in this direction at this point. Yeah and like i said, my system has the conditions for it to thrive, if it wasn't this cyano it would probably be something else, more likely worse. I fought a losing battle with my first tank with bubble algae. It completely took over. I am not letting this do the same, so that is why i am trying to be so aggressive with it. Are there any other thoughts on what the source of these nutrients could be coming from. Someone said leeching from rock/sand. Is there any way to check if that is the case? How long could it be leeched if that is what is happening?