What is the noisiest part in your aquarium?

[shrimpchips]

For me it's the air intake on my BK 180 mini.

Originally Posted by Myka

Oh, the Tunze Osmolator is actually louder than anything else when it is topping up the water.

I had that too - until I used a piece of styrofoam to float the motor so it doesn't vibrate against the bottom of the tank. And the additional advantage is that if I do hear it humming on the bottom, I know it's time to top up the ATO reservoir.