microbubbles?

[fiorano]

i just hooked up my new sump wuth an external pump and there is loads of micro bubbles going into my tank . i think there from my skimmer but the guy who built my sump didnt put enough room behind my baffles to put my skimmer there so the out nozle on it is just behind one baffle. so does anyone know a qick fix for micro bubbles i can do before i can add more baffles or whatever?