Whisper Power Filter 60 Whisper Power Filters Are The Best-Selling Brand Of Power Filters In The U.S. Appropriate For Every Size Aquarium, They Provide The Three Types Of Filtration That Your Aquarium Needs: Mechanical Filtration -- To Remove Particles Such As Uneaten Food, Bits Of Plants, Fish Waste, Etc., From The WaterBiological Filtration -- To Provide For The Growth Of A Colony Of Beneficial Bacteria That Will Eliminate Harmful Toxins In The WaterChemical Filtration -- Activated Carbon Removes Compounds That Cause Odors And Discoloration Of The Water .
Biological Filtration -- To provide for the growth of a colony of beneficial bacteria that will eliminate harmful toxins in the water
Chemical Filtration -- Activated carbon removes compounds that cause odors and discoloration of the water
Mechanical Filtration -- To remove particles such as uneaten food, bits of plants, fish waste, etc., from the water
Two of these on back of 30-60 gallon aquarium would be best as it means less work for you. But I suggest you turn filters off during feeding time because 2/3rds of food is sucked into the power filters, as power filter does it's job very well.
Whisper Power Filter by aquabrad from Fresno, CA12/25/2012
The Whisper Power Filter is a good product but don't expect to take it out of the box and plug it in. Check the "O" ring where the motor assembly comes together. I am 3 for my last 3 in having the filter leak after setting it up because of this issue. And the "O" ring appears to have a defect in it (and may well have one) but if you're careful putting it all together it will work without leaking. I would purchase the Top Fin equivalent when I can find it for a cheaper price.