I know this is a controversial topic but I stopped at a LFS today to buy my usual Instant Ocean brand and the guy behind the counter told me I should think about switching to Red Sea salt mix. I have used Instant Ocean in two tanks now and I have never had any real problems but the guy at the LFS says Red Sea salt is more natural and I will see more coral growth by switching brands. Is there any truth to this? Has anyone used the Red Sea salt mix after switching from another brand and see any noticeable difference?