Running CO2 24/7 at one bubble per second and running aeration with air stone or HOB filter 24/7 guarantee enough carbon for plants and safe conditions for fish.
Would this be as good? Ebay Needle ValveI use a Victor single-stage regulator and a brass Ideal 52 series -1- needle valve with 0.019 Cv (full open). It takes 20 turns to go from full shut-off to full-open. The valve is rated up to 3000 psig. Cheaper valves do not have full shut-off capability. If one cannot afford the $75 price tag, then go with the Fabco NV-55 valve. It's around 15 to 20 bucks with FULL taper needle for a bubble tight shut-off.
So do I run the tank to zero psi? Absolutely. Never had any problem with excessive CO2 level in the water column since 1996.
"Normal" CO2 injection should not cause the pH to vary more than 0.8 point. This is safe for all aquatic inhabitants. However, a drop of 2 points can cause problem for aquatic life unless there exist a period of acclimation.
Not much information about that valve except that it has a flow coefficient value of 0.004 at 1000 psig.
Ok, thanks for the info, I just see it listed on some models, but not others...but you are saying it's there on all of them?The burst disc is a required safety feature of all regulators. It's there in case the cylinder is over filled or gets over heated. Much better to have the burst disc rupture than the cylinder have a catastrophic failure.
Is that good? You refer to the coefficient value at 1000 psig, and below in the other posts the coefficient at a certain amount of turns, so it's hard for me to compare since I am not knowledgable enough about what characteristics to look for.Not much information about that valve except that it has a flow coefficient value of 0.004 at 1000 psig.
Yeah, I saw that very valve mentioned in the FAQ I was referring to in my reply to REX. It was closer to 30 dollars though so I was looking at the one Rex mentioned to see if it's similar.My favorite low-cost needle valve is the Fabco air NV-55. It incorporates a lot of high-end features like bubble tight shut-off, straight tapered needle, and linear flow vs # of turns graph. List price is around $20, but I've seen them for $15 or less. DO NOT overtighten ANY needle valve because this can damage the orifice and needle assembly!
Is the Ideal series the Swagelok?Yes, the more expensive 31 series "S" Swagelok valves are good, but they also cost an arm and a leg. These units are rated up to a maximum flow coefficient of 0.004 at 10 turns.
The Ideal 32 series -1- are rated at 0.0019 with 20 turns. I like the 1/8" female NPT connections. Pipe threads are very strong and provide a bubble tight joint without much hassle.
In general, a needle valve with lower Cv and higher # of turns will give you more flexibility when metering the CO2 to your tank. If you have extra $ to spend, then go with the Ideal 52 series -1- straight body brass valve. I believe it is one of the best needle valve under $100. You can buy the Ideal valve by contacting the manufacturer or through Mc Master Carr. You can also purchase 1/8" brass female NPT connectors from Mc Master Carr to attach this valve to your regulator and your CO2 line. BTW, Mc Master is a very good source for many needle valve interconnects.Is the Ideal series the Swagelok?
Are those type of connections something I could use with any valve I buy?
It's hard to keep up with you guys when specs. and features are mentioned with no frame of reference for them.
I'm sure you 2 are following each other, but some of us bystanders may not be.
A UPS is your best insurance against this happening again......DCI have been following the sometimes heated debate on wether or not to run a CO2 system at night or to supliment O2 with an airstone or powerhead at night and wether or not we are putting our fish at risk. I realize that in a well balanced tank with everything running smoothly, a CO2 system running at night should not deplete O2 levels to a dangerous level or cause a major fluctuation in pH.
But, what if something goes wrong? I have a beautifuly planted 55g tank that had, I emphasize had, a great little population of micro and dwarf rasboras. It was filtered by a HOT magnum. Thursday night we had some storms go through and lost power for about an hour. The HOT magnum decided not to fire back up. Today, I found most of my cool little fish floating with a few staglers gasping for their final breaths. I may save 4 out of about 12 of the fish.
A small air pump with an airstone and a timer could have prevented this tradjedy. It also would have been much cheaper than replacing the fish.