This hole what sale to use thing is such a mind ****. I keepin looking at the salt test results in the sticky thread. Seachem, Aquavitro, H2Ocean and even my RC all have the target levels I want to keep. The numbers on them all look good to my and what I want. RC is the cheapest and most available to me. I my just stick with RC, I just dont know. Maybe I will give one it one more try. If I see my sps continue to looks better after the bleaching I had, then I will just keep using RC. If not then I will change for sure. There are after all so many nice tanks using RC.