How do i adjust the air flow on my red sea nano filter?

Question

I just got it and wanted to know this before I put it in my tank :)

Answer 1

Do you mean water flow?

At the top of the intake tube there is a circular piece with a ridge on top.  You turn that and it will make the water come in differently.  Make sure you have the lid on it when you switch settings; mine overflows at the lower settings.