Dave that skimmer looks like its working well. 1 thing I don't get about the design though is why they make such a small diameter neck? It looks like there is a good concentration of bubbles in there. Making a wider neck will only increase skimmate production
Dareal i used that skimmer for quite while....awesome little skimmer!
I f you're going to mess with the skimmer, it wouldn't be a bad idea to make a drain for the collection cup also. Sometimes skimmers freak out which could soak your floor.