Originally Posted by SpEd
at what levels of alkalinity and calcium are considered too high and a threat to the aquarium?
Anything above NSW
chemistry is pretty much unneccessary. As far as dangerous, it really depends on what is in the tank, most affected will be invertebrates but fish as well. Some animals will "weather" higher alkalinity <15 DKH
but it does stress them severely. Higher Ca
) can cause polyp bail out, both can cause RTN
and clam mantles will lose their cohesion to shell walls. There is also the high probability of a precipitation event.
at 1.5 - 3 mEq/l with a <<balanced>>
ratio to Ca
. Also be sure to test before you add especially until you are very familiar with the tank rate of depletion and consumption of CaCO3