enclosed my review of the product. I once set photos and a video still follows.
I had bought the bubbler for my aquarium (80 x 50 x 35). But not for fish, but a "The Walking Dead Fish Tank" project to build.
Who knows the third season knows what I mean.
The processing of the bubbler is very good, the unit is pretty small and handy. And quiet at that (my personal opinion).
But you should have just stand on 4 feet or you can make even a foam mat. Who this is still too loud can indeed a small box made of polystyrene tinker and adjust the pump as inside. A wandering of the pump there is not because of the rubber feet.
I then got a piece of tube cut off and made between the non-return valve. Here you have to pay it, that is pointing the black round plastic edge to the bubbler.
Otherwise flows out any air. The 10 meter hose is very flexible way, and one can move him just fine.
On the whole I am satisfied with bubbler for the price. It is well made and works quietly and the bubbles produced are also abundant. Instead of the stone you can connect a vent curtain also eg.
Greeting Micha