Do I need co2? - The Planted Tank Forum
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post #1 of 18 (permalink) Old 09-03-2011, 12:19 AM Thread Starter
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Do I need co2?

hi all. i have a 125 gallon filled with crypts and various swords. last month i put 156 watts of t5ho light on . my question is do i need co2? eqipment is 2 aquaclear 110s hob filters and an aquaclear 30 powerhead for a bit of flow. everything seems stable but i just want the best environment for my fish and plants.
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post #2 of 18 (permalink) Old 09-03-2011, 02:20 AM
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It depends. How are the plants looking? Any algae outbreak?


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post #3 of 18 (permalink) Old 09-03-2011, 04:53 PM
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CO2 is a basic "need" of all plants. Either you provide extra CO2, or the plants can only grow as fast as the supply of CO2, from the atmosphere and from breakdown of organics in the substrate, allows them to grow. With the amount of light you have, assuming those bulbs are located right at the top of the tank, the plants are being greatly restricted in growth by the shortage of CO2. That makes them extremely vulnerable to algae attacks.

It is the amount of light you have that drives everything in the aquarium.

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post #4 of 18 (permalink) Old 09-03-2011, 06:18 PM Thread Starter
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no algae outbreaks yet and plants seem fine but the lights have only been on a month.
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post #5 of 18 (permalink) Old 09-03-2011, 06:23 PM Thread Starter
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ok if i get co2 would a paintball canister setup work for a tank this size?
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post #6 of 18 (permalink) Old 09-03-2011, 07:00 PM
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ok if i get co2 would a paintball canister setup work for a tank this size?
Yes, it would work, but you would want to buy enough canisters so you could visit the refill station once a month with a dozen or so canisters to fill. Maybe I have the numbers wrong, but, seriously, a little paintball canister wouldn't last more than a few days supplying adequate CO2 to that big a tank. And, that is a very expensive way to buy CO2.

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post #7 of 18 (permalink) Old 09-03-2011, 09:30 PM Thread Starter
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Yes, it would work, but you would want to buy enough canisters so you could visit the refill station once a month with a dozen or so canisters to fill. Maybe I have the numbers wrong, but, seriously, a little paintball canister wouldn't last more than a few days supplying adequate CO2 to that big a tank. And, that is a very expensive way to buy CO2.
ok, thanks for the advice. anyone know how to do pressurized co2 cheap? haha
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post #8 of 18 (permalink) Old 09-03-2011, 10:14 PM
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Check the swap n shop forum every day for a good deal. Also, check Craigslist every day. Good deals do show up, but not every day or even every week.

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post #9 of 18 (permalink) Old 09-04-2011, 05:16 PM
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Check your local welding co. I swap out a 20 lbs co2 tank every year for $16.


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post #10 of 18 (permalink) Old 09-07-2011, 06:18 PM
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Check your local welding co. I swap out a 20 lbs co2 tank every year for $16.
20lbs in a YEAR??? I use 20lbs a MONTH!!
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post #11 of 18 (permalink) Old 09-07-2011, 10:28 PM
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ok if i get co2 would a paintball canister setup work for a tank this size?
Sure it would. But you'd be swapping out a new tank frequently. Get yourself a 20lb co2 tank. Maybe two and keep one in storage until it's needed.
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post #12 of 18 (permalink) Old 09-07-2011, 10:29 PM
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20lbs in a YEAR??? I use 20lbs a MONTH!!
You probably have high levels of PAR ?
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post #13 of 18 (permalink) Old 09-07-2011, 10:52 PM
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20lbs in a YEAR??? I use 20lbs a MONTH!!
hmm, somethings is wrong there. It shouldn't go that quick. You might have a leak. I'm running a 75G and 20lbs seems to last a year at ~5 big bubbles/sec for 6 hours every day.


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post #14 of 18 (permalink) Old 09-07-2011, 11:25 PM
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hmm, somethings is wrong there. It shouldn't go that quick. You might have a leak. I'm running a 75G and 20lbs seems to last a year at ~5 big bubbles/sec for 6 hours every day.
Im seriously pumping much more than 5 bubbles per second. its a 120 with 2 overflows and a sump!
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post #15 of 18 (permalink) Old 09-07-2011, 11:36 PM
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Im seriously pumping much more than 5 bubbles per second. its a 120 with 2 overflows and a sump!
Are you ok with it? If not, I'd find a more efficient way. It should last at most 6 months for a 120.


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