I've only just begun thinking about a disposable bottle set up to be honest. Only got into this tropical fish lark May of this year!!! I don't like the idea of using a FE, the idea of the handle always being depressed concerns me, plus they take up too much room. So the 600g disposable bottle option makes sense to me. I can get them fairly cheaply near me too. I've been looking at the Sealey disposable regs (the one's with the guage) on ebay, but other than that I've only just begun looking into the other parts needed to build my own disposable reg. Obviously need a needle valve and I want a solenoid too so i can switch it on and off automatically. What's the link to the suitable 6011 solenoid you found?