Review on Saim UFO Ornament for Aquarium 🛸 Fish Tank - Enhance Air Action and Decoration by Brenda Young

Didn't work initially. The small air release valve stuck further up. I took everything apart and the small weight that fits in the valve fell out. So I just glued it back on and it works great. You must have an air control valve for this to work properly. If you just connect an air duct to it, it just stays on top. requires very little air to operate. All I used to fix it was a steak knife to remove the blue cap from it and just took the rest off.