Skimmer Help

[Jason McK]

I just finished my new sump (with Jacks help, Thanks Jack)
I put my Red sea Berlin skimmer in and it began running as normal. With in a few hours it was not producing any bubbles at all. Admittedly I had some flex tubing that was in the drain pipes and they were well below the water level.
I have since cut them down so that they are just at the waters surface. But no bubbles. I can blow into the air intake to produce bubbles but when I stop there is no suction for intake.
With my drain hose mod should I just wait a bit or could you suggest a way to start the suction again

I'm planning on upgrading to a OA skimmer so I really don't want to spend a lot of time or money to get this one working

Thanks
Jason