I'm going to get a water changer (maybe a diy one using a watering hose and a faucet adapter lol, the real ones are so expensive ) for my upcoming 55g and have a couple questions: How do you condition the water during a water change, using a water changer hose? Do you remove the fish before before refilling then condition the water, and re-add the fish? Or do you put the unconditioned water straight into the aquarium with the fish still in, then condition it? Other? Something silly that I just can't figure out. Also, for a 55 gallon mbuna cichlid aquarium, what's a good weekly water change amount? I was thinking between 15 and 25%, probably 25%?