I now have 20 lbs of live rock in the 40 gallon tank. And I just added an inch deep sand bed. Can I remove my fluval canister filter? Im asking this here because: my filter has carbon in it. If an octo ever inks, could I just hook up the filter again with the carbon or does the carbon need to be "aged" to properly remove ink? Also my filter has mechanical filtration, does a tank need this?