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					Originally Posted by Myka  I used to feel the same way as Darryl and Tony about Instant Ocean, but having made the change back and forth between IO and H2Ocean 4 times I've noticed a significant change in my reef tanks each time.  I won't use IO on my reefs anymore, I've decided IO is for FO tanks only.  I haven't used RC on my reefs in many years, but every once in awhile I use it on my FO tanks when I can't get IO.  Besides, H2Ocean is natural sea salt - there has  to be a difference using natural sea salt as opposed to synthetic sea salt...there has to be.    | 
	
 What changes do you notice when switching between the two? I have been looking into trying H2Ocean but figured it was likely not worth the extra cost.