12-30-2009, 06:26 PM
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You can, but not the one I posted, you'd then need something like this one Hydro-Sponge III, Sponge Filters | Pet Solutions
It really always depends what you wanna have in the tank in the end. Like the 25g CPO tank I had, obviously I didn't want the lil Cray baby's sucked up by any internal filter and the whole sock over it just ain't my world, so I added a large sponge into it, the system I used is called HMF (Hamburger Mattenfilter) just punch it into googel and see.
If I had just normal fish in it like Tetra's or Killi etc...I'd honestly pers not bother and get a small internal filter.
Like I said, really only depends on 2 things: Personal preference & what you wanna do with the tank really