I GOT IT!!! the regulator arrived in TWO days from Aquatek... This is exactly what I wanted.
Although I don't have 6 tanks (YET), but have it hooked up to the 3 tanks I have now. One thing I want to note is that the needle valve on the Aquatek regulator is not "overly" sensitive, so it's easy to adjust bubble count and keep it very steady. (I had a JBJ regulator in the past, and the needle valve was very unstable... bubble count would fluctuate all the time).
Overall, the unit is very well made.
So far, I'm very happy with this product...
i think it's time for me to go set up my 4th, 5th and 6th tank. Thank you everyone for your suggestion and advice.