Vertex is good but there are a tun of skimmers for in sump action that are better unfortunately the best cost more than they weigh in gold. But you get what you pay for in this hobby. If you go cheep then you get cheep and the head-achs to go with it. I've been in fish my entire life, saltwater for 21 years and I don't know everything just what I use. As dose anyone else some have used alot of different skimmers and others only a few. If you put a sump I would just go to a conical cone skimmer I have hear nothing but good things about them there are a few companies that make them.
Here is a pic of my Aqua medic skim cup after 30 hrs:
http://i749.photobucket.com/albums/x...k/100_1937.jpg

The proof is always in the pic.
Now that is black smelly skim.
Bill