This is a dumb question but it is something i have never done before so i believe that enquiring is better than loosing
I have a mature tank with a mature external filter, due to the size of the fish now i think i need to add another.
My thinking is to add the new external filter straight onto the tank as it surely wll not do any harm with a mature filter already running.
I can see no harm.
But something inside my head is niggling me, it's saying NO more has to be done.
Am i right to have that niggle or not.
I have a mature tank with a mature external filter, due to the size of the fish now i think i need to add another.
My thinking is to add the new external filter straight onto the tank as it surely wll not do any harm with a mature filter already running.
I can see no harm.
But something inside my head is niggling me, it's saying NO more has to be done.

Am i right to have that niggle or not.