Fluval Skimmer

I have a Fluval skimmer that will no longer skim. Would anyone have any ideas on how to get it to start skimming again

Thanks

Hey,
Is this the skimmer you are referring to?
https://youtu.be/WEFb5ks8Now

I have never had any and don't know what the problem is with yours but it looks like there are several parts you can try to adjust. You could first try to move the "skimming control knob" and see if anything changes. You can also try to move the transparent top part.
There are also a few comments below the above-mentioned youtube video that may be worth reading.

Hope this helps ;)

You can also make your own skimmer with a power head and an old plastic water bottle