I would have to agree with high alk in ZEO system, I lost about 450$ worth of SPS when i was running ZEO.
However someone already mentioned Copper? LFS will test for free.
Even if you never treated with copper it could have come from old life rock if you got it "used".
Or a penny could have been dropped exidentally in to your sump and or tank (Kids?)
Small wire cut dropped in?
Copper screw?
At any rate i would test for copper just to be sure.
If you still using ZEO get you alk down to recommended lewels.
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