I just bought a bucket of Seachem Reef Salt from Coral Ranch Friday. I've been on RSCP for the past few months. My tank looks great, but there have been a few things bothering me. My biggest concern is that RSCP is harvested from the wild. When in suspension on the large body of water that makes up the Red Sea, any anomalies are diluted, whereas at home, in my little 29g, a little too much silica or metal of some sort could be devastating. I developed a nuisance algae problem while using RSCP, and it continued after many water changes and feeding as little as possible 2-3 times a week.
I'll keep you posted on my success with Seachem