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Originally Posted by Abbyreefer
I used to use IO as well and switched to Kent for the same reasons (ca and alk were low) better now with Kent.
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I haven't found IO so low the levels can't be easily raised with additives, I don't like keeping my ca and alk too high because of mineral build up in powerheads. I keep my calcium around 380 and my alk at 9 dkh and the corals don't seem to suffer
