Can i siphon the substrate before a water change but put some of the water back
in?
Exemple: if i’m going to do a 10L water change but to siphon the substrate i have to take 20L out, can i put the 10L back in and top it off with new water?
in?
Exemple: if i’m going to do a 10L water change but to siphon the substrate i have to take 20L out, can i put the 10L back in and top it off with new water?