02-08-2011, 01:30 PM
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As posted elsewhere, I would go with a sponge filter. Hydro specifically. No mineral and fertilizer-removing carbon - no filter water flow issues as long as you buy the right sized air pump - good for planted tanks, good for forest fish, no need to buy more media and constantly replace it. Just squeeze out the sponge filter in removed tank water about once a month and you're good.
Relatively inexpensive filter as well. Most chain stores won't even know what a sponge filter is and I had to convince my LFS that the filter wasn't only used to breed fry. Might be best to order it online with an air pump.
Sponge filters with the right air pump can work well up to at least 125 gallon tanks.