Lol... Big = more $$ and more committment.
Actually I prefer nanos....
you can get better better eqpt with lower financial muscles.
Maintenance also so much easier. just 1 small pail of water for WC.
Remembered I had to change to 2 large pails for my previous tank.
Large tanks... give you a headache and backaches
If you have time and $$, really 6 ft will be very nice....
I have neither, so this will do for the time being..... maybe until my girl grows up.