I got one of these with my setup that I recieved from my aunt, and so far it isnt skimming.. I took it apart and tried setting it up differently multiple times.. I've tried just leaving it running for weeks to see if it needs to break in, but so far no microbubbles or foaming at all.. I don't know what to do anymore.. Anyone ever used one? or can anyone give me advice on why it might not be skimming.. My skimmer was a hob style on my old tank and much easier to use, this one is nothing but head aches.