It happened in the middle of my tank move. My Caulerpa sporulated. This morning I took some stuff out of the nano to put into my new 50. The water was clear. Two hours later I looked at it, the water was green and cloudy. I looked at the refugium, and half the Caulerpa was white. In all the time I had Caulerpa in a 10 gallon refugium it never happened. It was a whole lot more crowded in the 12" refugium. It is not crowded anymore after cleaning out the dead stuff. I took some pictures to post on my site, but need to set up new FTP settings. :x
I am sure nobody cares, but I put the pics on pbase, along with the first of my new tank before it cleared.
http://www.pbase.com/rcipema/newtank