Might the target level for CO2 be lower in a tank with "misting"? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 11-16-2009, 02:25 AM Thread Starter
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Might the target level for CO2 be lower in a tank with "misting"?

Hi all,

I have read as much info as I can find on the misting method of CO2 delivery. Previously, I was using Rex style external reactors on both my EI tanks, with reasonable success. Like most people, though, I found that the output from each canister was slowed considerably with the reactor plumbed inline with the outflow.

So, I bought two Hagen Elite underwater filters and set them up as diffusers in both tanks (45 and 72). I seem to be getting reasonable results in the 45 gallon... however, in the 72 gallon the plants seem to be pearling, but I can't seem to lower the pH by a full degree with the misting method. Perhaps this is just simply due to a lack of circulation in the 72 gallon (since it is a 4 foot tank).

I would be content to just watch the plants in the 72 and see how they do, but there already is a degree of BBA, so I want to make sure my CO2 is optimal, lest the algae get out of hand.

So, my question is, can you get away with less CO2 if the misting method is used? Since not all the CO2 is dissolved with this method, should I aim for the same drop in pH as I had before?
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post #2 of 5 (permalink) Old 11-16-2009, 03:42 AM
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I use the misting method and I dont worry about how the levels of co2 are in the water really, I have my diffuser and powerhead counterpart in the rear of the tank blowing into my stems and the co2 bubbles just get snagged on the plants and stick there for consumption. Dissolving the co2 is really kind of pointless in a misting method imo because you lose so much more than you dissolve. I have a really crappy diagram i made for you, the bubbles snag in the stems and then whatever misses the stems and cruises along the back wall hits another powerhead to truck the bubbles over the foreground plants.



I dont know if you can get away with less co2 concentration dissolved in the water, but I know if you have enough sitting on the plants, it doesnt matter it seems.
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post #3 of 5 (permalink) Old 11-16-2009, 03:59 AM
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Not sure if I can provide the best answer, but misting whether by Mazzei or Needlewheel is just another diffusion method (an efficient one). Your monitoring system, whether it is a drop checker or pH probe will tell you if you are achieving an optimal dissolved CO2 level.

Bill

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post #4 of 5 (permalink) Old 11-16-2009, 01:11 PM
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The best way to tell if what you are doing is working is to watch the plants. If they are healthy then it is fine. If they look stressed and algae starts to show up then you need more CO2. (all other things remaining constant)

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post #5 of 5 (permalink) Old 11-16-2009, 03:33 PM
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Quote:
Originally Posted by SCMurphy View Post
The best way to tell if what you are doing is working is to watch the plants. If they are healthy then it is fine. If they look stressed and algae starts to show up then you need more CO2. (all other things remaining constant)
+1

Regards,
Tom Barr




Regards,
Tom Barr
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