So I was wondering how one would go about DIYing a protein skimmer for a 75 gallon DT with 40 gallon sump.
I am a massive cheapskate, and I feel like available protein skimmers are so expensive for what they really are. Other things like this in the hobby I understand and could make myself. Additionally, I wouldn't want to buy a protein skimmer and then just set it up, as I wouldn't know how it works well enough. I would if I built one myself.
I like the design of this skimmer:
http://www.reefworkshop.com/DIY_proteinskimmer1.htm
What I mainly don't understand is how the foam is generated: beckett, venturi, etc.