CO2 BPM for a 6 gal? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 07-31-2006, 06:38 AM Thread Starter
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CO2 BPM for a 6 gal?

I tried using the search, but couldnt find anything helpful...just finished making my DIY CO2.

From what i've read, it seems like you want to inject til about 20-30ppm of CO2. I currently don't have a test kit, so what would a rough estimate of BPM be if i wanted to acheive that? My tank is in the beginning stages so there is not too much flora at the moment, and i dont want to kill my fish that are in there...

Anyone want to give me a rough estimate of how many BPM i should be putting in there?
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post #2 of 5 (permalink) Old 07-31-2006, 04:28 PM
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I'm a minority viewpoint here, so keep that in mind.

I don't worry about bpm or measuring my CO2 levels overly much. If you don't have extremely high light, CO2 is a just boost to the plants (at high light you have to have it to keep algae at bay). If the fish show distress, add some surface turbulance to drive to gas off and try a slower mix (less yeast) or run a filter or air pump part of the day to drive of the excess. Otherwise just change it when it slows down.

At 6 gallons, you may find flourish excel to be less hassle than CO2. My 6 gallon eclipse is the only tank I don't supplement at all. But then it's mostly slow, easy growers.
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post #3 of 5 (permalink) Old 07-31-2006, 08:18 PM Thread Starter
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basically what i want to know is how much CO2 can i put in there without harming my fish...(or can i harm somthing else as well?)
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post #4 of 5 (permalink) Old 08-01-2006, 02:38 PM
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Quote:
Originally Posted by agdavis
basically what i want to know is how much CO2 can i put in there without harming my fish...(or can i harm somthing else as well?)
Sorry to say it, but you as you said, you can put 20 - 30 ppm safetly. BPM are not the same for everyone. Also safe will depend on your water harness. CO2 brings down your pH, too much CO2 will eat up all your buffer and make your pH crash (Trust me I know).

So too much CO2 can do 2 things:
1) the fish will not be able to respire
2) the water will turn very acidic.


Get the test kits, your fish will thank you.

Walter

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post #5 of 5 (permalink) Old 08-01-2006, 07:40 PM
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Many folks are beginning to strongly question whether or not CO2 can crash the pH, or will it just drop it to 5.5 or so. One viewpoint is, as tazcrash69 posted, and the other is that the pH is not an issue, only the high ppm of CO2 is an issue for fish. My view is that I need to keep an eye on my fish and shrimp if I increase my bubble rate, just to be sure they are not uncomfortable with it. So, I have raised my bubble rate a little each week until I found that BBA was no longer trying to start up again on the leaves. My fish didn't seem uncomfortable, so I left the bubble rate where it stops the BBA. For my tank, with my method of introducing CO2, and with my water circulation, that bubble rate is around 3-4 bubbles per second.

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