Posted: Wed Apr 22, 2009 5:59 pm
A few months ago, you could get a brand new Fluval 404 for about $80 from eBay. That'd be a great filter for a 50 gallon, plus you'd be able to use it if you upgrade your tank. I'm not sure if they're still around though.
The next best "bang for your buck" I think is the Rena XP3. They're similar gph to the fluval 404, and I think they run around $115-125.
Sometimes you can find deals on craigslist too, but you don't want to pay too much for a used filter.
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Frankie, "Young at heart."