Although alkalinity and ph
are linked, while the chemistry is reversed in the fashion indicated above, full precipitation will not occur. There will be small unnoticable instances of abiotic precip but that happens in most all reef tanks. As long as the magnesium is in sufficient quantity (1200+ ppm
) there should be no reason for full precip unless the Ca
concentration becomes quite a bit higher than it is now.
With the daily additions to correct the failing Ca
with either a dry or liquid form of CaCl
and no additions
of alkalinity products, the chemistry will eventually shift in the calciums favor and force down the alkalinity. There is really no benefit of having alk
above a range of 4.25 mEq/l with a balanced Ca
. If you have a refugium with macro algaes and the like I would actually keep it just below 4.0 mEq/l or it will inhibit it's growth.