I guess there isn't any hard and fast rule of when to wc.
I guess too that each individual hobbylist will hv their own wc regime.
everyday I draw out 2 pails of tank water to water my plants and replace with fresh tap water, weekly 70% wc
my tank is a 422 with 3 xbs and 3 rtgs + a ff + tiger and a black wolf
Btw, I no professional. I've nvr used any testing equipment
