Thanks,
What I'm trying to do is convert a 20
gal glass tank into a sump/refugium. I am not going to be placing my protein skimmer in it or using any bioballs. So on the side (the right-hand side) were the overflow spills into the tank, will I have to construct walls inside the tank to divide it off or can it simply spill into the refugium (those increasing the size of the refugium)?