Flaxon-Waxon
Aquarium Advice Addict
I plan on switching out 50% of my water in my 40 breeder tank, and was wondering what the best way to do it was. Would it be better to drain 20 gallons and replace 20 gallons at one time? Or would it be better to drain 5 gallons then replace that 5 gallons and then another 5 gallons etc. etc.? It seems like if you don't do it all at once, then you are just replacing some of that clean water you just put back in the fish tank…?