how many c02 units for 30 gallon tank - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-19-2008, 02:16 PM Thread Starter
 
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how many c02 units for 30 gallon tank

As the question states, how many c02 units do I need in my 30 gallon tank. I have one hagen system on there right now...I would like to add more, the 2 lt bottle method.. There is roughly 2 wts per gallon on this tank I think... 1 coralife fixture 2x14 wt fixture...and 1 18wt t8 ocean sun super daylight bulb on the tank..
Any help would be appreciated
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post #2 of 6 (permalink) Old 11-19-2008, 02:26 PM
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CO2 is measured in ppm (parts per million), and to know how much of it you need- we'd need to know more about your water chemistry. Test for pH and KH, and tell us what you have. There is a "target" CO2 level, which is proportional to pH and KH. This will get you in the ballpark, anyways. From there, we can determine how it should be distributed (diffused) so that your target CO2 levels are met.

Adding CO2 is one thing- adding the proper amount is quite another. You want to add the proper amount. Anyone can make bubbles, but if you don't know how much, or how it affects your water chemistry- you're shooting in the dark. Compared to algae, plants are more complex and their growth (health) is dependent on certain factors, which when met in the right proportions, sustain health and offer excellent growth rates. When any of these factors are out of proportion with the others- you get problems...lots and lots of problems. Not only are the plants stunted, algae often takes hold. Since algae is a highly adaptive, simple life form, it can thrive on these imbalances. Introducing a syncopated level of CO2 is just inviting it to take over. Disease often finds a way in under these imbalances, too.

So, the short version is: measure your pH and KH before doing anything else. It's very important (if not crucial) to knowing how much CO2 to add. Alternatively, you can choose your desired pH level, and adjust KH/CO2 to reach it.
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post #3 of 6 (permalink) Old 11-19-2008, 04:28 PM
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if your buffering capacity is low and you add a sizeable amount of CO2 to the system...can the pH change kill the fish?


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post #4 of 6 (permalink) Old 11-19-2008, 04:49 PM
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Quote:
Originally Posted by steak View Post
...can the pH change kill the fish?

Yes.
Wild pH shifts (either attributable to improper CO2 levels, or otherwise), will certainly pose a threat to fish. Whether it kills them or not depends on the fish- suffice to say they won't appreciate it.
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post #5 of 6 (permalink) Old 11-19-2008, 05:42 PM
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I think pH swings resulting from CO2 are usually ok. Excessive CO2 levels are a different thing.

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post #6 of 6 (permalink) Old 11-19-2008, 11:06 PM
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the PH itself is not normaly a problem unless you have a fish thats very sensitive to it, but the co2 itself makes it harder for the fish to expel thier own co2 from thier gills
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