Can You build one with a glass aquarium? I have a 10 gal. and would like to use that. I am in the process of setting up a 40 breeder and want to try a refugium.
I used a new mop bucket ($6) drilld holes in it and put it in a 20g tank. Then I filled the bucket with sand cheato and rocks and that was my sump/refugium for my 40breeder works like a charm and no problems once I got the flow right.