I got this one, FUMAK Super Mini Aquarium Air... https://www.amazon.com/dp/B0C3HL38G6?ref=ppx_pop_mob_ap_share, it puts out as much air as the tetra 10 next to it and it's absolutely silent. The tetra is also silent, but it vibrates if it touches anything. These piezo units don't vibrate at all and they still work even if I tighten down the size air stone really tight.