Hi folks, I bought a brand new Aquaclear 20 for my 10 gallon ADF/betta tank today. Hooray for Petco coupons! I set it up tonight and have it running on the tank along with the old Topfin filter. This thing is loud! It can almost drown out the air purifier on the other side of the room. This tank is in my bedroom and I never heard the Topfin filter. With the AC....I can hear the motor going and I'm guessing it's shaking a little bit. I've removed the lid which helped a tiny bit. And it's level as far as I can tell. Any suggestions for quieting this thing down? Or should I take it back to the store?