I've actually heard of that happening before too, especially with halimeda. I was pretty worried at first but when it all cleared up and everything was normal then I could relax
Its all in my main tank, I dont have the space right now for a separate fuge on it, as much as I'd love to.
I guess if it all went sexual and died at once then I would have a problem... but everything is perfectly normal.
Kinda neat to see stuff like that happen in your own tank, hehe.