Hi,
Don't wanna buy double - I already have mine.
Here's the solenoid + regulator setup I got - same seller, same model. I can confirm it fits the NZ bottles out of the box: http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0578967676
If you want to save a bit of money, you can get a single stage regulator: http://cgi.ebay.com/CO2-Diffuser-Atomiz ... ltDomain_0 or http://cgi.ebay.com/Aquarium-CO2-Regula ... plies_Fish
I wouldn't recommend it though, as the single stage regs apparently cause 'end of tank dumps - i.e. when the CO2 tank runs out, a dual stage regulator keeps the operating pressure (i.e. gas going into your aquarium) very stable as the bottle finishes. A single stage reg however will just dump all the gas, at once, into your aquarium and cause harm to your fish. However, if you keep an eye on tank pressure, you can avoid such an event easily by refilling the tank. The tank _SHOULD_ last for several months. Mine lasted for 2 months while gassing both my tanks, but I think that may be because I opened the valve without hooking up the reg to see what would happen And a good amount of gas escaped due to me being overly curious.
I'd get the dual stage personally - it's a one time investment.
You also need the following parts
- US -> NZ wall socket power adapter (if you get the solenoid reg)
- Timer (so you can set the CO2 to come on and go off with your lights). My CO2 is on a separate timer - it comes on 1 hr before lights, and goes off 1hr before lights.
- Diffuser (Ceramic, In-Line, your choice. I run an in-line one on my 200L, ceramic on my 38L)
- Brass Check Valve
- Bubble counter (not critical, but makes fine tuning CO2 injection really really easy).
- Polyurethane tubing (I recommend the black tubing, not the clear, - their diameters seem slightly different, and I could not fit the tubing onto my my glass diffuser. The black tubing, worked perfectly.)
- CO2 Cylinder/Bottle (Obviously). I got mine from a place that sells refurbished fire extinguishers - $200 for a 3.5kg bottle IIRC. $11/refill IIRC.
- Drop Checker (checks CO2 saturation - not critical but useful)
The above information is all you need to set up your system _b Decided to post it here rather than PM so everyone can benefit from it, rather than pay >$600 for a local package with a 0.5kg cylinder that will be out in half a month.