Hi Graeme,
Great to hear that, finally I could ask someone regarding DIY pressurised system. I have been reading from some people who has already had it up and running and was wondering how much it is to buy the needle valve, bubble counter and etc.
The one I was contemplating was from http://www.toolsonline.co.nz/html/engineering1.html (7 items downwards), which was put up in one of the topics under aquatic plants. Was just wondering whether it's worth the $$$ and time to set one up myself or just get one from Sera/JBL. A quote i got so far is $500 for a whole system + 500 g bottle cylinder. Didn't think it was a bad deal.
Anyways tell me what u think. Cheers.