How to open the oil film hole for triple overflow

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How to open the oil film hole for triple overflow

I bought a finished cylinder and found that there is no hole for the oil removal film. I want to make a hole myself. I want to ask you how many holes should be opened for the oil removal film. How big should it be? Where is it opened?I take the water surface as the center of the circle, is it ok to make a hole?,
=======The following are Yuyou comments=======
whcd163 Comment: This has not been done yet
There are always Diao 003 Comments: I really dont know, dont dare to talk nonsense
1956 little cute comment: no need to open
Longer Obedient Comment: This one has never been used
LDianG Highlights Comments: It should be opened under the water surface, it should work, but this hole is not easy to open
Lyu? Comment: This is now
Lyu? Comment: This is now
Lyu? Comment: This is now
Smile lightly Comments: and horizontal line, please like
Beijing, Tianjin, Hebei, flowers, birds, fishes and insects Comment: Aunt with water level map will give you the answer
STJMH: Surf pump can produce a certain speed of water in the tank, so that the static water into a continuous circulation of living water, conducive to the movement of arowana, conducive to eliminate BB at the bottom of the tank. +
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Surfing pump can generate a certain speed of water flow in the tank, so that the still water into a continuous circulation of living water, conducive to the movement of arowana, conducive to remove BB bottom of the tank. ,
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