I've always used H2O in my Reef System, everthing has been great...I tried switching to IO once when I was out of H2O and couldn't find any locally, everything went sideways for a bit until I switched back...I really don't believe it was the IO's fault but rather the sudden change that my system didn't like, now I keep a large supply on hand so I don't have to change things up at the last minute.
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Glass box with stoney stuff and fisches...
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