I have dosed as high as 17ppm (2tsp in a 100g system) without any negative issues with my RBTA. It had split 2x (after not splitting for 2 years) but I believe that was dus to the pH/alk issues I had from using the unbuffered C tabs, instead of the pure, buffered powder. I am still dosing 1/2 that, continuasly, w/o any issues to any of my corals--SPS, LPS, softies & amenone. The only weird thing is it is staying on the glass rather than the rockwork, where it was for 2 years.
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