Co2 level in Plant only Tank - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 03-24-2013, 01:00 AM Thread Starter
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Co2 level in Plant only Tank

Hey guys i have a quick question. I recently purchased a pressurized co2 system for my HC only aquarium. (NO FISH). I also have a solenoid connected on the system. Currently I have a slight string algae problem and i am hoping the Co2 will take care of that.

1) My question is how much Co2 can i pump in ?
2) Is there a point when there is just too much co2?
3) What is the optimal PPM for HC growth and reduce algae?

My set up
10 gallon (regular size)
t5OH 24 watts with direct reflectors
ADA soil


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post #2 of 15 (permalink) Old 03-24-2013, 01:03 AM
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I don't think you can have too much co2, as long as there is no livestock. Check with someone else though, just to be sure. I need to see this tank, sounds cool!

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post #3 of 15 (permalink) Old 03-24-2013, 01:07 AM Thread Starter
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Quote:
Originally Posted by CPDzeke View Post
I don't think you can have too much co2, as long as there is no livestock. Check with someone else though, just to be sure. I need to see this tank, sounds cool!
Thanks for the quick reply.

This is a link to my tank.
Ada Iwagumi Tank And Steps --Photo Heavy--
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post #4 of 15 (permalink) Old 03-24-2013, 01:55 AM
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post #5 of 15 (permalink) Old 03-24-2013, 02:03 AM
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I'd base it off the HC response, really you're wasting your CO2 with that wattage if you pump in for more than 15 or 20 ppm. You should strive to deliver as little to them as possible and still get good growth and maybe some cool pearling!
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post #6 of 15 (permalink) Old 03-24-2013, 02:04 AM
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post #7 of 15 (permalink) Old 03-24-2013, 02:23 AM Thread Starter
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Will the algae die off at that PPM ?
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post #8 of 15 (permalink) Old 03-24-2013, 02:38 AM
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I could be mistaken here but the CO2 won't kill off the algae. The algae needs to be starved of the nutrients feeding it and this is best accomplished by having growing plants, consistent CO2 levels, and consistent mineral and fert levels. Algae is far more adaptable than the plants so when these levels get out of balance, the plants will sometimes shut down and the algae steps up its game.
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post #9 of 15 (permalink) Old 03-24-2013, 03:27 AM
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The only thing you can do is waste it... I'm sure there's a point where it diffuses into the air more than plants can use it.


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post #10 of 15 (permalink) Old 03-24-2013, 04:09 AM
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You can hit a point at which growth starts to be stunted but it's pretty high. In terrestrial plants ideal/economical artificial CO2 rates are between 500-1000ppm. No idea what that translates to in aquatic plants. Couple helpful charts:



And what Idrankwhat says, CO2 doesn't kill algae, it just helps the plants out-compete it.
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post #11 of 15 (permalink) Old 03-24-2013, 05:23 AM
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turn it up to 11!
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post #12 of 15 (permalink) Old 03-24-2013, 08:43 PM
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You can up the CO2 for sure as its seems like you have lot of excess light. Do you have pressurized CO2 and how are you diffusing it.

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post #13 of 15 (permalink) Old 03-24-2013, 09:31 PM
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You could shoot for 50-60 ppm but you'd really be wasting CO2. Start it up high and then turn it down until you see decreases in growth.
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post #14 of 15 (permalink) Old 03-25-2013, 12:30 AM
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I just turn mine up to where my drop checker is an almost invisible yellow. However, it's good to keep it close to where it's going to be with fish after a few weeks unless you never plan for live stock.
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post #15 of 15 (permalink) Old 03-25-2013, 07:12 AM Thread Starter
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Quote:
Originally Posted by vvDO View Post
You can up the CO2 for sure as its seems like you have lot of excess light. Do you have pressurized CO2 and how are you diffusing it.
Yea actually I have a lot of light for the tank. it's a "ho" bulb and it only about 12 inches away from the HC. I am using a pressurized system with a ceramic glass diffuser.


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I will give it 40 ppm a test for now and see what type of results I get.

One more question. Should i be turning on my Co2 1 hour before light on and 1 hour before light off to decrease Co2 fluctuation during photo period ?
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