Gresham- Can you explain or post a link with more info on the Flow-through rotifer culture system? You also mentioned there are a lot of people using this method. Can you ask any of them to share their system design? Thank you.
http://glassbox-design.com/2010/azoox-nps-coral-continuous-feeding/
Go to the NPS forum here on RC, or do a global search on RC for refrigerated dosing pump and you'll find a few threads.