I've been changing 25 gallons every week on my 150 gallon fish tank and 10 gallons on my 55 gallon. I'm not sure if I'm doing it correctly. After removing the water from the tank I run the hose into the tank to refill it then add tap water conditioner for the chlorine. Should I also add bacteria? should I treat the water before adding it? If so, how do I treat it first and then add it to the tank?