Fishman007
Aquarium Advice Addict
I had a spare penguin filter catridge laying around from when i had a penguin 100 filter a while back. I have had this aqueon quiet flow 20 on my 20g and decided i would try to put this spare filter cartridge to use. So i stuck it right behind the aqueon catridge and it the flow looks fine. Could this actually work as a pre filter for the aqueon cartridge? I will take it out over the night till i get answers so no sweat. Thanks