Michael,
I've been mixing IO and Oceanic for about 6 months now but only recently (last month) switched over to all Oceanic. If I'd been doing water tests in the last 4 months I would have noticed the Ca rise and Alk drop. Many others using Oceanic have seen this as well, which is why I'm convinced. I'll be going back to IO now as well... pity they don't sell the 200 gal buckets anymore
