05-07-2014, 11:30 PM
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OOOPS!!! My Bad, sorry, forgot Marineland made HOBS. Anywho, thats still a good deal as long as it works, and those bio-wheels are in good shape. Those filters run around $40.00-50.00 at Petsmart. If you gotta replace the wheels, they cost around $10.00-15.00. In that case you would be better off buying new. My only HOB preference has always been AquaClears, they are the most "customizable" and versatile of all the hobs I've seen. The AC 30 would be perfect for a 20 gallon. If that Marineland checks out O.K and has adjustable flow(I'm pretty sure it does) go for it. A proper size AC only costs $30-35.00, sometimes cheaper on Amazon.