I've been dosing for about a month now. My findings are odd. The main reason I started dosing was for the benefit of my zoos. I can't explain it, but most of them were multiplying like crazy, but then reached a point where they either stopped, or started disappearing. Not "all" of the varieties, just some of them.
I haven't noticed that much of a benefit yet the zoos I was having trouble with yet, but my SPS has taken off growth wise like crazy. I've always had a problem with cotton candy algae, and have also recently noitced it starting to pale considerably from it's nowmal dark red color.
My skimming has also improved greatly. I run a G-4 for about 160 gallons syatem, and the skimming has always been pretty mild. I know the skimmer I have is over kill so I never worried about it's performance too much. Since dosing the C however, I'm getting an increasing rate of dark skimming production.
There are definite improvements do to the C. I just wish they would have a more positive effect for the reason I originally intended.