This might be a dumb question.... Do you turn your canister filter off when you do a water change? I always unplugged my HOB's during water changes, but someone told me you should NEVER turn off a canister except when you clean it.... Something about anaerobic shock (whatever that is).
I just turn my in-tank heaters off, but because I never do more than 50% wc's the filters stay on, but you can turn off the canisters too if your maintenance is not going to take too long.
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