DIY CO2 Diffuser for Fish Room: - The Planted Tank Forum
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post #1 of 4 (permalink) Old 05-30-2019, 07:37 PM Thread Starter
Algae Grower
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DIY CO2 Diffuser for Fish Room:

Does anyone know a reliable CO2 diffuser for use in a fish room? I'm planning to set up multiple tanks with them so buying each one at $10 a piece adds up quickly.

Can airstones be used as diffusers? Chopsticks?
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post #2 of 4 (permalink) Old 06-25-2019, 06:02 AM
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From what I have heard airstones are the least effective method for diffusing co2
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post #3 of 4 (permalink) Old 06-25-2019, 03:42 PM
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Very much depends on several small points and your tolerance of bubbles in the tank is one of the bigger items to consider. Growout tanks where appearance may not matter, make a stream of bubbles okay, while the main show tank, you may not want to see ANY bubbles. Airstones give a pretty obvious stream of bubbles, while something more effective like a Grigg's reactor may cost more but certainly worth it as they do away with the visible bubbles.
Size of the CO2 stream is part of the question as a few bubbles per second is easier to deal than a solid stream. If you need 15-20 reactors, it can cut the cost a whole bunch if you buy parts for a reactor in groups of ten rather than single items when shopping the big box stores. How you power/filter the tanks is a big part of the question as well. Common pump system or individual filters?
Details change the answers.
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post #4 of 4 (permalink) Old 07-01-2019, 04:16 PM
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You could just invert a plastic bottle in the tank and fill up with CO2. The CO2 will diffuse into the tank with no bubbles or loss.

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