sounds about right to me. if what you have been doing is keeping the Ca levels at 400 then that is good. i would only worry bout raising it if you have a bunch of stonies or clams in there. as long as you keep monitoring it once a week and it stays stable i think you are on the right track.
i do not know which parts is parts on those 2 part supplements.
G~
i do not know which parts is parts on those 2 part supplements.
G~