there is several sponge filters on ebay for less than 5.00 that includes shipping i have bought a few and they work fine.
Run many sponges..even in tanks that have HOB and canisters...quick bacteria source for new or QT tanks....inexpensive to boot....
I've seen a few tanks on here and some in a (very nice) LFS in Austin using these sponge filters. I was wondering how good they are and would they be recommended?
These are the ones with the sponge sitting on the bottom of the tank and a hose going to a powerhead.
Thanks

only draw back are trying to clean them out completely, they trap and hold soooo much dissolved poop its unbelievable, ....