I have one that I really like that came 2nd hand with a tank my father-in-law bought maybe 6 years ago. It's a Green Leaf Aquariums (GLA) regulator. I believe it's a GLA Gro-1 (http://www.petzonesd.com/gla-gro-1-aqua ... regulator/). This specific model isn't sold any more
I'm debating right now between:
- GLA Gro (single stage)
CO2 art Pro SE (dual stage)
SR Aquaristik (single stage)
The dual stage from CO2 art is priced right between the SR Aquaristik (cheapest) and GLA Gro. Honestly, if GLA still had the exact regulator I already have, I'd probably just get another. Since I can't get the same thing, what have folks used and what do you like?
I use pH controllers and timers as a safety measure and probes have been recently replaced.