My new Aro tank:
400 litres sump. six chambers in it.
Above it, with 500 litr/hr pump, wet/dry with foam and bioballs.
Inside the last chamber ( from where water is pumped back into the tank ) I have another pump (2500 litres/hour ) that sends part of the filtered water back to chamber 2 to do the sump circuit again.
Alongside the sump ( and working with the sump ) I have an Eheim cannister full of Chemi Pure ( could be full of carbon, if needed ),
and I still would like to have more, because this tank is FULL.
In all my other tanks, the least I have is 2 big cannisters ( 2280's and 2260' and 2250 Eheims as well as those overflow boxes ??)