i have started to view fish related videos. in all of these videos, when a water change is done, the bucket of clean water is added through the top of the tank. i have been adding it to the intake of the sump. this way it goes through all the media and does not disturb the main tank. the water would be more "fishy" and less sterile when it gets in the main tank too. is there any reason why i should not be doing it this way? i don't think i am that clever so there must be a reason why everybody is not doing it this way. i put the bucket on a chair and then a hose from the bucket to the sump.