Hi Laurent. About a week ago I had the same problem. I got home & the wife said something was wrong with the RSM - the water was white. When I ran in and looked at the tank it looked like it was filled with white paint! I couldn't see a thing for all the bubbles. Thankfully all of the life in the tank was unaffected. Since then I've become a lot more diligent with topping off, rather than thinking it can wait till tomorrow. michaelaz's advice on lights off for a few days would be good to try. That algae needs light to grow and depriving it will help.
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Excellence in reefkeeping is achieved by mastering the fundamentals, and learning from mistakes.
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