I have used IO almost exclusively and have never had issues with PH or with Trace and I have alot of coral... So I don't pay the extra $$$$ for the more expensive salts.
If you wish, Dennis at Golds had a breakdown of what each salt did, contained, etc. I don't know if he still has that, but because of his research, this is why he no longer carries Reefers Best Salt (Zeovit) and this was long before he stopped carrying the Zeovit line.
IMO, Instant Ocean is great, but if you wish to use a more expensive salt, it will most likely do a great job also.
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