I would like to know, what kind of sea salt does everyone use in their reef aquariums? I have heard that the red sea pro coral salt is not what it claims. is this true? What is the best salt to use? I have been putting Instant Ocean salt in my aquarium for a long time but, I now have learned that it is low in magnesium and there are better salts out there for reef systems. your input will be very helpful. Thanks: Kevin