Co2=1.0??? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 10 Old 02-14-2015, 11:59 AM Thread Starter
Exclamation Co2=1.0???

I have a 15 gallon tank w/ nine danios and three tiger barbs and a lot of plants. Today I tested my water:
GH=13dGH
KH=3dKH
PH=8.0
CO2= 0 Based on the schedule
NO2=0
NO3= somewhere between 0 and 12.5
I use flourish excel fert 5 ml every other day.

based on the schedule I read 5.0 is the ideal level.

Do I really have to worry about my CO2 level?
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post #2 of 10 Old 02-14-2015, 12:52 PM
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Too much co2 will put all your fish on the top of the water struggling for oxygen.

Low levels of co2 won't really matter unless you're running high light full pressurized systems with top notch plants.

11 tanks @ 660 gallons currently active... From river monsters to rasboras. Check out my YouTube and subscribe!
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post #3 of 10 Old 02-14-2015, 03:39 PM Thread Starter
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Originally Posted by SirReal303 View Post
Too much co2 will put all your fish on the top of the water struggling for oxygen.

Low levels of co2 won't really matter unless you're running high light full pressurized systems with top notch plants.
My light is one tube of T8 IP67 lighting(fluorescent) 15 watt.

Does my CO2 low level matter?
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post #4 of 10 Old 02-14-2015, 03:46 PM
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Is the CO2 level causing a problem?
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post #5 of 10 Old 02-14-2015, 03:53 PM
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Not really. First, because you dose Excel which is an alternative to CO2 (I believe the dose is 1 ml per 10 gallons daily= 1.5 ml for a 15 gallon tank). Second, because the relationship between KH/pH and CO2 is flawed
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post #6 of 10 Old 02-14-2015, 03:55 PM Thread Starter
No, I read that aquatic plants need CO2 at minimum level of 5.
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post #7 of 10 Old 02-14-2015, 03:58 PM
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It depends on what you are trying to grow. Many plants will grow without co2. If you're growing plants that REALLY need a co2 dose it's gonna take more than a t8 bulb to grow them at full potential. Most co2 systems are gonna give you benefit on a high light setup with more difficult plants.

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post #8 of 10 Old 02-14-2015, 04:02 PM
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These are 2 of our pressurized CO2 tanks.


This first tank is a 20 long with a quad t5 ho light @ 96 watts.





This tank is a 40 long with a quad t5 ho @ 216 watts


11 tanks @ 660 gallons currently active... From river monsters to rasboras. Check out my YouTube and subscribe!
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post #9 of 10 Old 02-15-2015, 05:16 AM
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All plants need co2 for photosynthesis, just not all plants require you to add co2. Kinda depends on plants and what live stock you have..... Like if you have a heavly stocked tank you won't need to add co2. Plants are always going to be limited by the least abundant reasorce so co2 might not help as much as you would think for 200 or what ever your start up cost would be.

P.s. I use excel on my ten everyday, seems to be helping..... Black algae prob is almost over for now
I dose 1 mill per ten gallons as stated above

Last edited by Embouck7; 02-15-2015 at 05:21 AM.
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post #10 of 10 Old 02-15-2015, 05:51 AM Thread Starter
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Originally Posted by corina savin View Post
Not really. First, because you dose Excel which is an alternative to CO2 (I believe the dose is 1 ml per 10 gallons daily= 1.5 ml for a 15 gallon tank). Second, because the relationship between KH/pH and CO2 is flawed
You're correct because today I used the CO2 test kit this morning, and the result was 8 mg per liter

Last edited by malbaiz88; 02-15-2015 at 05:56 AM.
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