Aqueon QuietFlow 20 aquarium filter. NEW $25

I absolutely love this brand of aquarium filter! It's SO quiet. However, I bought this for my 15 gallon tank because I wasn't sure that the QF10 was doing the job. It is WAY overpowered for my 15 gallon tank. It displaced all the sand and scared my Julii Corydoras into hiding. I used it for a total of 7 days - and bought it brand new. So, essentially, it's a new aquarium filter. I left the the filters seeded. Use them that way or wash out the biosponge. Your choice. Used a total of 7 days.