That's cyano. Cyano comes in a rainbow of colors. I'm not sure I would blame the switch on the salt. It is spring-time and lots of tanks get sudden cyano outbreaks this time of year. There is a lot of chit chat about pollen in the air causing issues, and people are really starting to look at this. There is also wonder about what may be making it by our RO/DI filters in spring run-off. This is a tough time of year for many tanks though.
I would suggest you keep on keeping on. Siphon out the cyano everyday if you can, or every few days. It should resolve itself in the next few weeks.
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~ Mindy
SPS fanatic.
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