Review on Uxcell Aquarium Curtain Diffuser 35 4 Inch by Valerie Sullivan

Bubble curtain is flexible as stated. However, he is very tough. If you don't connect both ends to the air hose, it won't work properly. Large bubbles come out at the end not connected to the air hose, but hardly out of the curtain. Alternatively, you can block the end that is not connected to the hose. Then it works perfectly and without problems. It also needs to be secured so it doesn't float in the tank. I used suction cups and plastic clips to attach it underneath.