Once you have removed and squeezed the mulm out of the old filter, do not add the media back to it, however... I would suggest keeping it on for a few more days running (media-less) just for added current .... once the tank clears up (12-24h) you should have just about enough to remove the old one (again after a few days... we want to keep the current) then ~ if you 'are' able to.. just give the substrate a quick stir ... (trying to get as much into the new as possible) .
Now I am sure there will be a few that say this is overkill .... but, to me.. I like the safe then sorry quote..
Now I am sure there will be a few that say this is overkill .... but, to me.. I like the safe then sorry quote..