skimmer question

[daddy01]

Hi,
I am running a Seaclone 100 skimmer (i know not the best skimmer) could someone explain (simply) what the 'bubbles' should look like in skimmer (or post picture) I adjust and adjust and adjust. On the adjustment I get bubbles going into my chamber, after a day they stop, then I get brown water in the chamber, adjust again and nothing.
Jim