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i have an aqualight deluxe series-double linear strip. it has a 36 watt Actinic and a 36 watt 10,000k straight pin compact fluorescent bulbs. idk which one is the blue one but someone told me that it promotes algea growth so i never use it. i was gonna go buy a bulb to replace it today but idk what k rating to get. the tank is a planted 20g with no co2. should i even bother getting another bulb to help plant growth if i dont have co2? can anybody help me? thanks
 

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I think just the one 36 watt bulb will be enough for a non-CO2 tank. You will be able to grow all of the low light plants, and a few of the moderate light plants, with that much light, and no CO2. If you add the second bulb you will be making it very hard to avoid algae issues when you don't use CO2.
 

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You should get better growth with the 6700, but the light change in your tank might not be the same as the 10,000. It is a matter of taste I believe and the growth rate should not be to noticeable depending on the plants you have. Personally, if the plants are doing well with what you got I'd just buy a 6700 and try it. You can always use either as a spare then later.
 
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