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Re: KH Drop
It could possibly be the Profile causing the drop in alkalinity. Someone
on the list, I think it was Wayne, had this same problem a few months ago
and it was traced to the Profile substrate. Nitrates also appeared along
with the KH/pH drop. Have you tested the nitrate level in the tank?
I would look to the substrate before suspecting the driftwood unless the
wood's been soaked in a strong acid at some point. I suppose it's
possible, but IMHO, it would take a tremendous amount of fungal activity to
drop the KH from 11 to 4 degrees in 4 days.