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I am using 6500K Ultrasun and 10,000K Aqueon combination on my 30 gal planted tank. I have a surplus of 10,000K tubes, do you think running 2x 10,000K tubes would be OK for plants?
Probably. Depends on the spectrum, but most likely will be fine. I use a mix of 6500k and 10,000k, only 10,000k, and only 6500k on my tanks.. no noticeable difference in any of them except the brightness of the tank.