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Hi! I just got some new Aquarium Co-Op sponge filters for my tank and am planning on replacing the old ones. I have a 10 gallon betta tank with a center divider and a sponge filter on each side. The tank has been established for over a year. I know that I will need to set the new filters in the tank while the old ones continue running, and that I should only add one new filter at a time, but how long should I wait before taking the old ones out? My brother said a month, but I’ve also seen 1 week. My bettas love their plants and I don’t have a lot of spare room in the base of the tank, plus one of the old filters has gotten noisy and it’s driving me crazy. Any advise would be appreciated! Thank you!
