How much PSI for 40b? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 02-09-2014, 06:18 AM Thread Starter
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How much PSI for 40b?

What should my output c02 be at? 40breeder - hightech tank w/ high light.

currently the psi is going into the tank at 30psi. What psi is ideal?
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post #2 of 5 (permalink) Old 02-09-2014, 08:11 AM
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Don't worry about PSI but rather BPS (Bubbles Per Second)
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post #3 of 5 (permalink) Old 02-09-2014, 08:28 AM
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Don't worry about BPS but rather pH drop.
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post #4 of 5 (permalink) Old 02-09-2014, 11:25 AM
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As mentioned, the pressure and bubbles per second is not really that important.

The generally used pressure is about 30 PSI. Atomic diffusers might require a bit more.

Bubbles per second serves only as a quick indication of whether or not you have CO2 flowing or not; a bubble rate that works for one person might not work for you. There are many factors (such as diffusion efficiency) that would play a role.

As mentioned, you can estimate CO2 levels using pH drop. Other people use a drop checker with a 4 dkH reference solution. Others just cautiously increase the CO2 and look for behavioral changes in livestock.


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post #5 of 5 (permalink) Old 02-09-2014, 02:05 PM
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The pressure you use will vary a lot depending on what and how you work the CO2. Some diffusers need high pressure to do anything at all. Others like a reactor just need enough pressure to let the gas flow into the water stream. For my various tanks, I've used as low as 4 and as high as 15 to feed my reactors. It will be a combo of what pressure, what needle valve, and what method of diffusion is used. Just take some time to play it up slowly while watching the fish is the way I go. I might suggest 15PSI to start and adjust from there.
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