After dosing for about a week, I have to say that I'm impressed!
Absolutely no side effects I can see so far. I am dosing between 1/8 and 1/4 tsp (hard to measure exactly with what I'm using) every day in a system with roughly 40-50 gallons.
All of my zoas are open, when normally there would be one or two varieties that are closed. I have probably 10 different varieties, mostly small 10-30 polyp frags.
My green palys are open more than I've EVER seen them in the year I've had them, and feeding response is good.
Other stuff like LPS and SPS either seem to be ambivalent, or a few with some good inflation (frogspawn and torch).
Fantastic results so far, we'll see how this fuels growth.
Lastly, what's the most anyone dosed (ppm or tsp per 100 gallon) on a long-term (months) basis?