Is it the only mechanical filtration in your tank? no canister or HOB filters? If it's the only thing keeping water clean (excluding bio filtration) I would leave it on. No proof that you need it on all the time, just seems like the right thing to do. Plus it'd be a hassle to unplug and plug it in all the time. If you have a canister or something then I would say yeah sure, why not.
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