In a sump filtration system, do you have to have a refug?
Most pre made sumps seem to have a designated area for this. But do you have to have one in a sump (or use one at all)?
If not using a refug, what could one use that area for? Media reactor?
Most pre made sumps seem to have a designated area for this. But do you have to have one in a sump (or use one at all)?
If not using a refug, what could one use that area for? Media reactor?