Knowing what the light is, is the key to figuring out everything else, like co2 and fertizers.
Hairgrass carpet?
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According to this chart:
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the Aqueon dual T5NO fixture sold at Petsmart:
http://www.petsmart.com/product/index.jsp?productId=11248153
Would give you around 35 par. That is the bottom edge of medium light. That may be enough light to grow the hairgrass with co2 and proper ferts. You could change out the "Colormax" bulb that comes with it, and put another 67k bulb in, that would raise the par some, the colormax bulbs don't put out a lot of par. Or, you could use your T8 fixture with it, and have higher par also.
the Aqueon dual T5NO fixture sold at Petsmart:
http://www.petsmart.com/product/index.jsp?productId=11248153
Would give you around 35 par. That is the bottom edge of medium light. That may be enough light to grow the hairgrass with co2 and proper ferts. You could change out the "Colormax" bulb that comes with it, and put another 67k bulb in, that would raise the par some, the colormax bulbs don't put out a lot of par. Or, you could use your T8 fixture with it, and have higher par also.
it doesnt come in a small enough size for my tank... would a floramax light work? the charts are kinda confusing, im still in summer mode 
If you are talking about using a different bulb in your T8 fixture, it won't really make much difference. I know that the smallest fixture in the petsmart link i posted is 24", but you could still lay it in top of the aquarium. Its going to be hard to find anything 20" long.it doesnt come in a small enough size for my tank... would a floramax light work? the charts are kinda confusing, im still in summer mode
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