Originally Posted by Ryan115
thats the reason i was asking, If i have a DSB wouldnt i need a deeper tank? The DT has about 3" of sand so do i need a DSB in the Fuge? Also what would be an ideal flow rate through the 20g long tank be?
A longer tank will give more surface area for the sand bed and better waterflow through the refugium. For waterflow I'd recommend around 200gph through the tank but no powerheads.
You don't need a DSB in the refugium but 1/2" of sand will provide a diversity of pods and worms.