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I use a 14000 and a 3000 above one tank. They put out about the same PAR but a totally different color off course. I think plants can adapt to many wavelengths as long as PAR is high enough. The question is, do you like the look of 12000K?
Yes you can, personally I would not like looking at a blue freshwater tank & 4 tubes are going to be seriously bright!
You will probably need near perfect flow & gas control to maintain the lights but yes the lights will grow plants.
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