Depends on the size/number of fish you need to quarantine and for how long? I'm using a 20 gal
for 2 adult Moors, no decorations or substrate. Started out with 1 filter sized for the tank, but since I had to hold off on PWC
's I added another due to ammo spikes. I will say that a fully cycled tank is important IMO
to avoid the spikes I've had to deal with.
Sent from my Epic 4G