I've heard from others on RC that this regulator can't be beat for constant flow regardless of weather the tank is empty or full. Here is a link:
http://www.harrisproductsgroup.com/e...fo.asp?id=9200
I already have to mess with so many things on my tank I promised myself that I would spend the extra money and save myself the hassle when I finally got a calcium reactor. The Praxair a few minutes from my house is actually able to get them (I found out today) and they are supposed to be calling me with a price tomorrow. I have a general idea of what it will cost so if it's way more than I'm expecting, I'll probably end up going with the one from aquariumplants.com.
Waxx