I bought a 20 gallon long off craigslist and it came with an "AquaClear 20 Power Filter" with Sponge and bio balls for filtration.

http://www.thatpetplace.com/aquaclea...-filter-20-gal

I thought it would be neccesary to get a 2nd filter so I got a Aqueon Quiet Flow 10.

http://www.aqueonproducts.com/produc...ilter74412.htm

The Aqueon Quiet flow is very strange and didnt know if anyone has good or bad opinions on this model. THe biological filtration is just the plastis pillars that dont seem to be very effective. Should I take this back and get something different?