When do you do your WC/ maintenance and what's your levels.

[Reefer Rob]

Winter schedule:
Approximately 10% water change weekly
Carbon changed monthly
GFO changed every two months or earlier if I see any algae in the tank.
Last readings:
Ca 420
kH 8.0
Mg 1290
PO4 0
NO3 0 but can be raised to detectable by dosing amino acid. Still not sure if there's any advantage to slightly detectable NO3.
Just started dosing Zeovit PIF.
Plan on trying some iron in the near future.

Summer schedule:
Whatever I get around to.