Hi Microbius.....
I already posted in your other thread, but I'll do so again here. I think your
skimmer could benefit from being raised a bit in your
sump.
ahhh....you know what?! I think I just realized that the
skimmer is sitting IN YOUR TANK! Is that right? I just assumed that it was in a
sump. Well...that makes things a little more difficult.
Have you thought about putting in a
sump? The advantage is that it gives the
skimmer more of a chance to skim the water that is richest in proteins. By having an overflow, the protein-rich water tends to get more concentrated in a
sump and then the
skimmer can attack the proteins in a more efficient manner.
If this is not at all possible, I would consider a way to raise your
skimmer and see if that helps.