It's still doing nothing, I can see some foam down the tube that goes up into the collection cup and occasionally a small blob of foam will get pushed by the airflow up into the cup, but that's it.
Would the outflow water have any effect on the skimming? I've got it going through about 3 feet of hoses to get into the tank. And the instructions seem to say you should have absolutely no restriction. It's about as good as I can get it though. Actually, I could try and rig it up as a HOB, it's just a slight piping difference between the in sump and the HOB version of the berlin, as far as I can tell. That way the outlet could be going straight into the tank.
I wonder what my chances are of buying the correct HOB pieces...