Need some ideas with a DIY Co2 system for my tank - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 04-27-2009, 02:51 AM Thread Starter
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Need some ideas with a DIY Co2 system for my tank

so i have a 30g tank with 130w PC fluorescent lights making it about a 4.3WPG planted tank. In this case, since my tank is a high light tank, how many DIY Co2 bottles should i be using? Would it be wise to use several 1 liter bottles together to create a faster reaction? i dont have money to work with a pressurized co2 system. I tried to compensate by making a DIY diffusor inside the tank using one of the powerheads to aggravate the bubbles in a cylinder tube i connected to the power head. It seems to be working pretty well but i want to be certain that all my plants have enough Co2 with the current light setting i have. If you guys have any suggestions, or things that can be added to my current set up, that you'd share that'd be great
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post #2 of 6 (permalink) Old 04-27-2009, 03:34 AM
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you can use multiple CO2 generators (2 L bottles or 1 gallon jugs)....

also you can lower your light and that would require less Co2.
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post #3 of 6 (permalink) Old 04-27-2009, 03:53 AM
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If the light fixture can be suspended above the tank, raising it a few inches will reduce the light intensity and make CO2 less critical. If you use a powerhead in-tank reactor, which it seems that you do, you can turn the powerhead on and off with the lights, which effectively turns off the CO2 when the lights go off. That lets you run higher concentration of CO2 in the water, without harmiing the fish at night. Then, using 3 - two liter bottles, setting them up one week apart, and changing one per week, will give you pretty uniform CO2 concentration from day to day. If it gives too much CO2, you can direct that powerhead's flow so it causes more surface ripple, and that both reduces the CO2 in the water, and adds more oxygen to the water, helping the fish tolerate the high CO2.

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post #4 of 6 (permalink) Old 04-27-2009, 04:13 AM Thread Starter
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Thanks for the idea Hoppy! but my power head is fully submerged like this one
http://www.youtube.com/watch?v=bg7fl...eature=related
and requires the outflow to be under the water to get my diffuser to work.
so my water is pretty still at the top. should i just use an airstone at night to assure that my tank has enough aeration? and just do the 3-2 liter setup that you talked about?
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post #5 of 6 (permalink) Old 04-27-2009, 06:10 AM
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If you find that you have too much CO2 during the day, and the fish are clustering at the surface gasping for air, you need to increase the surface disturbance. How you do it isn't important. You could aim the filter return flow slightly towards the surface, you could raise the powerhead a bit higher so the surface ripples from its flow, or you could try an airstone, but that would likely be much too much.

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post #6 of 6 (permalink) Old 04-27-2009, 08:22 PM Thread Starter
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Sounds great! Thanks for your help Hoppy =]
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