Two cartridges in a marineland filter?
I just (FINALLY!) set up my tank, a 56 gallon, and have two Marineland Penguin 200s on it for now. During set-up, I saw a note that says adding a second cartridge behind the first one would give you "superior filtration" or something like that. The filters only come with one cartridge each so I'd have to go buy some more.
Does anyone know how much better it would be to add a second? I'll probably do it anyway because it can't hurt, but I'm just wondering what difference it would make.