Quote Originally Posted by CoryDude View Post
Could be that you had an abundance of organics in the water when you added the skimmer and now there isn't enough to make a showing. How much are you feeding? I'm also assuming you clean the contact area every few days?

Either way, I don't think you'll be disappointed when you upgrade to venturi skimmer.
I usually just rinse out the cup every couple of days. Is it bad to clean it off? It is skimming. I just usually never catch it skimming but last night was the first time in a while where I witnessed some foam spilling over the cup edge.