DIY CO2 Diffuser Placement Question - The Planted Tank Forum
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post #1 of 3 (permalink) Old 05-06-2020, 02:45 AM Thread Starter
Algae Grower
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DIY CO2 Diffuser Placement Question

Quick question, I just set up a new 20g high with the DIY citric acid/baking soda CO2 kit set up. This is my first try with CO2 and I did my homework but I’m just curious where the best placement of the diffuser would be? Right now I have it as low to the substrate as I can on one side of the tank with the HOB filter output flowing pretty close. It seems to be pushing the bubbles around pretty well right now so no complaints. My question is I just watched a video of someone putting the diffuser directly into the HOB filter materials area and letting it spread the bubbles that way through the tank. Has anyone else tried that/is this a better way to spread CO2 bubbles?
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post #2 of 3 (permalink) Old 05-06-2020, 08:19 PM
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if you are getting good distribution of mist throughout the tank, if it ain't broke no need to fix. but you could experiment.

you could try to position your hob on one side of the tank and the diffuser on the opposite side, if your hob's surface flow is strong enough. also, you can place the diffuser a little higher up. remember to provide good surface agitation and shoot for a 1pt pH drop before lights go on (it will take 2 or more hours to get there).

as to injecting co2 into the filter's intake, i've never done it.
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post #3 of 3 (permalink) Old 05-07-2020, 03:00 AM
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Possibly better to use the outflow of the HOB's water return to drive the bubbles and mist down into the tank and diffuse it around the plants.

The issue with DIY CO2 and diffusers is overcoming the pressure needed to drive the gas though the sintered glass diffuser media. Which, as it ages, it require more and more pressure that's usually easily overcome with a pressure CO2 system.

The DIY system is better at delivering low pressure, less than say 3 to 5 psi, which is why DIY works best if you can use a dedicated small powerhead to chop up the low pressure big bubbles. It will be noisy.

Starting small, keeping it simple..(?)
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