Coralife skimmer help

I just hooked up my Coralife Super Skimmer (HOT) a few hours ago. After initial flooding my of my floor a little from having the dial open too much, I think I have it running as directed.

My diffuser block (output) is running water through it but it is also overflowing a little. Should I be concerned? I have set the water level just below the collection cup as directed.

Also, how long till I see build up?

Thanks!
 
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