Perhaps a complete coincidence....
I don't know if any of you have followed the "Crystal Sea salt saga" over at RC (particularly in Shimek's forum), but among a slight bleaching event (only a few corals - Pocillopora and Pavonas) that ocurred when I switched (back) to Crystal Sea from IO, every single bit of Bryopsis died.
I had a few patches that ebbed and flowed over 2.5 years. The only controlling factors were my fingers...until the salt switch. Also, I never had Bryopsis (or any real nuisance algae) back when I used Crystal Sea (for 2 years, prior to 2.5 years ago....)
Anyway, there were a few others who also noted nuisance algae/Bryopsis die-off (some without any coral bleaching) when switching to the salt (and some who had no algae die-off)...anyway, there seems to be some slight correlation.
My mistake (as far as the bleaching) was likely that I changed almost 1/3 of the tank with a new salt brand. I wasn't thinking...but I didn't lose anything. My only advice is that if you were to ever try this, to change over slowly....as in 5% changes at a time.
Just thought I'd pass this on...