DIY Nano Protein Skimmer Aquapod 12

[Snaz]

I think the problem is water is not getting into the skimmer very easily so it is just skimming same 50ml of water over and over. I need to add some holes up the side of the reaction chamber below the surface to allow water to flow through easily but I fear the micro bubbles will just escape.

In a conventional air operated skimmer how do you get new water into the reaction chamber?