alexraj

Hi,

Should I measure these before 15-20% water change or after water change?

Regards,
Alex.

capekate

For myself, its always a good idea to test before water changes. This way it lets me know what the perimeters are and how often I should be changing the water. If you decide to test after a water change be sure to test 24 hours later and not right after the change.
~ kate

jsalemi

Agreed -- it's best to check the chemistry before making any water changes so you know the current state of the tank.

alexraj

Thanks. Will do the checks before water change.

Isabella

I agee with all of the above advice