Just a "for what it's worth" experience. I once found my pH was reading 7.6 or lower consistently. I panicked, and started trying to figure it out, tons of reading, a couple of discussions with Randy Holmes-Farley, testing at the LFS, etc. Realistically, if it was really 7.6 or lower, I should have seen my tank contents dissolving. I got new probes, new test kits, and kept getting low readings (I too was aggressive with my Ca reactor). I eventually solved my pH problem by throwing my meter over my back fence. That particualr tank went several more years successfully growing corals to the point I had to throw frags over the same back fence.
I think sometimes we worry too much about things we shouldn't...
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Brad
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