Hey Cow, I don't have an answer but a question for you... did you ever have a problem with brown algae? If so how did you cure it? I am having a problem with the brown and now the green is showing up also. I have a post about 4 below yours and I've only had 2 replies so far but they were helpful. I sat here for over and hour waiting. You may want to read them maybe they will help you with your problem... don't really know. I'm still very new to this.