Anyway the point is they all use a different filter cartridge. I am starting to make 'em myself, which saves $$ & gives me a good "Martha Stewart" feeling!
I want some tips on making filter thingees! I have an idea of making some "pillow-like" things instead of the plastic cartridges. What if I rolled some filter floss & carbon chips and made like a "pillow".
Then I could stick one in each tank........all the same & homemade!
(Hope I'm explaining this right....I'm picturing a rectangler-ish pillow)