It would seems that holds only if the only nitrate source,
for example, is the chems you're dosing. Lots of fish,
complicates things and the frequency matters, just in the
sense that, if you wait too long between changes and the
nitrates keeping climbing, well, the inevitable end isn't
pretty.
Scott H.
--- Andrew McLeod
The frequency of your changes is irrelevant to the final
level of nutrient
you will have AFTER each change
and fertilisation, but to avoid spikes change water
regularly.
=====
S. Hieber