CO2 needed?

[CaitxSith]

If I recall correctly... yes, it's 6,500k.

...or it could just be a 4000k bulb.

I hate how my memory sucks...

 

[gmh]

The bulb may have the K rating stamped on it.
Not sure how the micro sword and Cabomba will do but the other plants should be fine in your setup with no CO2.

 

[DAVIDFBT]

You don't need CO2 if your light levels are high enough.

Might want to reread that.

Whoops, I meant low enough. 6500 K would be perfect for a planted tank.

 

[CaitxSith]

The bulb may have the K rating stamped on it.
Not sure how the micro sword and Cabomba will do but the other plants should be fine in your setup with no CO2.

Well...

Seems like my bulb's old or something - I can't find the darned stamp. Just says 26 watts and something about warnings and higher wattage or something...

HOWEVER, I KNOW the K range is between 4,000 and 6,500... I just don't know specifically.

Thanks for the info.

*EDIT*
Whaddaya know...
I check out the website for the bulb and I get a Kelvin of 5100 to 5300.

 

[CaitxSith]

bump.


I'm guessing I'm going to need a bit of CO2 with:
26 watts
5100~5300 Kelvins
10 gallons

hmm...

 

[jmhart]

First, you'll want to upgrade that bulb. 5500k is really the minimum that will grow plants, where something like 6500k should be used. Generally, if the bulb doesn't reveal it's kelvin rating, it shouldn't be used for growing plants.

With 26w of good 6500k light over a 10g, I would recommend co2.