I have a reef tank it is on my LG monitor
I can choose or change fish very day and no feeding require and they never poop or get bigger
So, no filtration of any kind required
I have about 10 air-tanks in the basement and a $600 air sump in the closet, new never used and all it toys :
They are all there for an emergency "Do I want to start up another tank "
Which of you will volunteer to take care of such a tank when I'm gone 3 months out of the year :-X