Checking water parameters
 

Hi fellow reefers,

When do you guys check water parameters such as nitrates, phosphates, alkalinity etc. before of after a water change?

Let me know

I check mine in between water changes (although not very often anymore) to see if my water changes are adequate to keep levels were I want them. I can then adjust my next water change to suit the conditions.

I also check between water changes.

Depends on what you want to achieve with your test. If you want to determine consumption, test before. If you want to determine a dosing plan to restore parameters to desired levels, test after a WC. Personally, I test before so that I can make changes to my dosing, then do a WC and dose my corrections and assume my corrections have fixed things. I test monthly-ish.
Dan