Instant ocean here and I've been thru a few others. I have a reef and still prefer its 380ish ca, 1300ish mg, 10dKH ish and dosing as required over the reef salts with elevated ca (I havent found the "reef salts to be any better in other testing. ex last 3 buckets of seachem reef ca 580, mg 1180, dKH 6)