I also use compressed CO2 without any pH regulator. However, I recommend
the Dupla CO2 monitor. I say this because of an accident when the CO2 level
got way to high and almost wiped out my 55 gallon tank of fish. Now, with
the Dupla, I can just glance to confirm "green=CO2 is ok"

While I am at it, here is what I got for my CO2 setup, sources and other
suggestions:
Tank

Rapids Wholesale - Co2 kits - 5-lb new steel tank with dual gauge regulators
$99 (#BD435)
http://rapidswholesale.net/Merchant2...tore_Code=RWOC
AS&Product_Code=BD435





Needle Valve
Florida driftwood - needle valve used in medical gases $19.50
Appears to be Clippard MNV-4K2 (4k2 has an 1/8 hose barb included)

http://www.floridadriftwood.com/product.asp?3=51



Also needs a ¼" NPT male to 1/8" NPT female adaptor (Clippard #15006-5) to
connect the valve directly to the regulator.

Can probably get where you fill co2 gas.



CO2 Reactor

Plant Guild Power Reactor

http://www.familychest.com/plantguil..._reactors.html

Note some online aquarium stores now carry the larger version of this, which
is what I have.



CO2 Level Monitor

Dupla monitor - Dupla CO2 Dauertest

http://www.dupla.com/start_e.htm





NOTES

You may be able to buy the Clippard needle valve - MNV-4K2 from a local
Clippard distributor. Check their web site
www.Clippard.com



To add a second 1/8-inch needle connector on the Clippard you need the
following parts from Clippard:



#15004 - Female Hex Connector - convert the 10-32 male inlet port to a 10-32
female



#11752 - 10-32 to 1/8 inch hose




Some people use other co2 reactors/diffusers. Lots of variety here so do
some more research on the web.

My 5 lb tank lasts about 8 months.



Be sure to look at local welding supply companies and at home brewing supply
stores for tank and regulator. Certainly will save shipping (partly offset
with tax).


--
Bob Alston
918.494.4913

"Harry Muscle" wrote in message
...
Does anyone out there have a setup where they use compressed CO2 instead
of
DIY stuff but still inject it without any sort of automated PH sensor to
control everything? I like the idea of adding the CO2 to my tank but I
don't like the DIY way, however, I don't like the fully automated way
either
(cost and PH sensor maintance), so I tought I would do it like the DIY
guys
do it (simply control it via a needle valve, correct?) and use a
compressed
CO2 tank. Anybody try this, does it work ok in practice? Looking for
feedback on the idea.

Thanks,
Harry




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