[Michael Hoaster]

Thanks taricha!

You've given me more to think about regarding possible causes. It seems that imbalance is a likely cause, whether it is too much, or too little of something. You mentioned it popping up after a difficult battle with other problem algae, when our tanks are often out of balance. Low phosphate seems like a long shot for me. I feed pretty heavily.

I think the biggest difficulty may be balancing killing the dinos with providing for the needs of the rest of the system. As with most algae issues, I suspect persistence is going to be a major factor.

Thanks for your thoughts on UV, blackouts and hydrogen peroxide!