Pretty sure this is ok, but just want to check....
Can I pour away the sludge at the bottom of my filter without risk of a mini cycle? I'm also replacing the floss, which makes up less than 10% of my media.
It's best poured away. Your bacteria live on the surfaces of the media; the sludge will be a mixture of dead bacteria and mulm, so you won't risk a mini cycle by getting rid of it
yeh any sludge at the bottom or on the edge of the canister you can pour away it dosent affect the media as the current miss treagueard said its pointless to keep it