skimmer bubble problem (film)

[jacky]

https://youtu.be/7wuUFSk8wto

Sorry everyone skimmer problem Like the film, it seems that it is impossible to stack bubbles and a bunch of bubbles in the water outlet. The following information: the water level is 24cm high, the inlet valve (black 23) locks back 2 times, the air hose does not block any abnormally, and the outlet pipe opening is about 1/3. My problem is: white cotton is easy to block after falling water (1 to 2 days will be replaced, very soon), why? (My guess is because of the start3 relationship?), the problem bubble seems to be unable to stack up to the collection cup. I have to extend the tube (the screw on the left side of the film) upwards by about 1cm. The problem is that the water pipe has a bubble overflow. . Can you help me with how to adjust first? Or need any information, I will try my best to let you know, thank you.