The problem bro is the skimmer itself. That skimmer is so crappy you are wasting a whole lot of electricity just to make it froth for a bit. So no matter how much adjustments you do to it, it won't be able to skim much.
Yung bubbles, depende yun sa intake niya ng hangin at sa impeller niya. So kahit bago lang yung tank mo, meron pa rin dapat na maaalis na dumi diyan.
It can be modified though, so you would just use one 8-10w powerhead and make it work efficiently too.
See here:
A properly working skimmer should have skimmate like the pics above, and the whole skimmer chamber should be filled with microbubbles like this:
Any less than that would be just a waste of electricity.
Medyo matagal-tagal ko na rin pinost ito, around 2007 pa.
(and yup, ako yang poster. Yan yung dati kong account na di ko na mabuksan.. haha)
http://www.reefphilippines.com/forums/v ... php?t=4617