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Old 10-24-2008, 12:24 AM   #1
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Lightbulb What bulb to choose

Hey everyone. I am wanting to do alot more planting in my 20g tank right now but am unsure what kinda of light I should be getting . I want a medium powered flourescent, just dont know the numbers on them. Also, at what point should adding co2 to the water be considered? I have heard about it, just not sure when it becomes necesarry. Thanks everybody.
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Old 10-24-2008, 12:45 AM   #2
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Stick with ~40w of T5 or slightly less w/o CO2, the 48w Nova fixture would prob be OK also
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Old 10-24-2008, 12:45 AM   #3
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Any lighting between 5000K and 10000K color temperature will work for plants. Is your 20 gallon a long or a high tank?

If you get up above about 40 watts, you'll need to start thinking about CO2 supplementation.
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Old 10-24-2008, 10:51 AM   #4
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its a 20 gallon high
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Old 10-25-2008, 12:13 AM   #5
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do you want to add co2? heck i have a 20 gal tank with 2 cfl bulbs over it and growing a lot of plants.
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Old 10-25-2008, 01:29 AM   #6
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I may consider adding co2 in the near future
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Old 10-25-2008, 12:33 PM   #7
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I have 65w over my 20 long and no co2. I have some algae, but I've learned that some algae is unavoidable. I have alot of stem plants to help take in nutrients. The 30" T5-HO fixture would probably be ok without co2. Keep your lighting period to about 8 hours.
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