I'm currently using Seachem Reef salt but about a week ago I bought two buckets of Redsea Coral Pro. There was a group buy on ARC and it was too good of a deal to pass up. I don't stick to a particular brand. I've used Tropic Marin Biowhatever, Salinity and a slew of others. I can't say I've really noticed much of a difference on any of them. :P