Ok so like the title says, I have an oceanic 72 gal bow front tank with built in corner overflow. it came with 2 tall cylinder shipped foam filters, but I pulled them to make 2 sponge filters for my growout tanks. Im wondering what I should use instead. Right now I put a bunch of scrubbies but they float! any suggestions would be great. I wouldn't mind doing different PVC setup (currently its a tube with machine done holes...came with it)