I've had tanks for almost 25 years now and when doing water changes I've always filled a bucket or trash can or pitcher... added salts, declor, and what ever I needed. Then found some way to get that water into the tank. Depending on the tank (150gallon) thats the headache of a water change to me. Im new to the forum and recently read about people just running the hose straight into the tank and adding whats needed straight in also. Whats your input on this? I always thought it would shock or even kill the good bacteria.