need help with co2 diffusion - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-19-2014, 05:15 PM Thread Starter
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need help with co2 diffusion

I have a 55 gallon tank with 2 aqua clear hob filters. Pressurized co2 , going to a GLA atomic diffuser. Due to the hob 's I have to really pump the co2 at a high rate to get a drop in ph from 7.5 with co2 off , to 6.5 with it on. And I really don't like the seven up fizz in the tank. I don't mind pumping the co2 at a high rate , but I would like to do away with the fizz. Any ideas?
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post #2 of 6 (permalink) Old 09-19-2014, 06:29 PM
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By fizz I assume you mean a distinct column of bubbles heading up to the surface. If that is the case then I think you've got your CO2 turned up to high. The visible bubbles should be no more than micro bubbles and should not be floating to the surface of their own accord. Being so small the current in your tank should disperse them to a point they simply disappear as the gas goes into solution.
If you mean there are a lot of micro bubbles in your tank making it appear almost like a fog then the only way around that is to move the diffuser out of the tank into a reactor.

Do you use a drop checker? It normally provides a good guideline on the levels of CO2 in the water. Your PH/GH measurements could easily be off and providing false results.
How do your fish look at the end of the CO2 period? Do you see any change in their behavior? Mine are very slow moving until the CO2 shuts off and the air pumps starts up. Then they are quite active.
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post #3 of 6 (permalink) Old 09-19-2014, 06:31 PM
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7up is always going to be a problem with a high rate in my opinion .. i would do away with hob's and get a canister this will save you pumping co2 at high rates. why the 6.5 ph target its seems a bit low,Myself im happy to get mine down to 7.6ph would be a dream to have 7.0.
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post #4 of 6 (permalink) Old 09-19-2014, 06:32 PM
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You need a reactor to dissolve as much as possible before it enters the tank.
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post #5 of 6 (permalink) Old 09-19-2014, 07:38 PM Thread Starter
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co2

As for the 6.5 pH. My tank is at 7.5 without co2 . it is my understanding you need a 1.0 drop in pH to get 30ppm co2 saturation. I have 2 drop checkers . one on each end of the tank, just for good measure , and added security check points. Thery turn blue when co2 is off , and go to green when it is at its set point of 6.5. I also have a pH controller connected to my regulator sylenoid. It holds co2 dead on 6.5 all day. It comes on one hour before lights on and goes off 30 min before lights out. My fish seem to be very active , and the same all during the co2 hours. And yes it is micro bubbles that are being produced , . since I have two hob filters churning the surface , I do have to pump in a high rate of co2. I am looking into a canister filter to help with this problem. Any way to inject the co2 into the canister filter to help diffusion? Or not?

Last edited by rick dale; 01-11-2015 at 05:46 PM.
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post #6 of 6 (permalink) Old 09-19-2014, 08:23 PM
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[QUOTE=rick dale;6699689]As for the 6.5 pH. My tank is at 7.5 without co2 . it is my understanding you need a 1.0 drop in pH to get 30ppm co2 saturation. I have 2 drop checkers . one on each end of the tank, just for good measure , and added security check points. Thery turn blue when co2 is off , and go to green when it is at its set point of 6.5. I also have a pH controller connected to my regulator sylenoid. It holds co2 dead on 6.5 all day. It comes on one hour before lights on and goes off 30 min before lights out. My fish seem to be very active , and the same all during the co2 hours. And yes it is micro bubbles that are being produced , . since I have two hob filters churning the surface , I do have to pump in a high rate of co2. I am looking into a canister filter to help with this problem. Any way to inject the co2 into the canister filter to help diffusion? Or not?[/QUOTE
I see... i try to keep it simple .5 drop and i run all night with no issues and it the stability is higher in my opinion i have great reds and growth.
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