Thanks for redoing the shots. See, it is amazing how the camera compensates in AWB mode, making the 4100 and 10000K look exactly the same. The 6000K mode seems to be what I would expect them to look like more or less.
Of course, human eyes are amazing things, able to adjust to anything.
In my tanks, I try to use a 6500K bulb in front, to make light green groundcover (Wisteria, Sags, Marsilea) look green. A 10000K bulb in the middle as it works great with darker tones. And a pink plant grow bulb in the back to accentuate reddish background plants like Sunset Hygro, Ambulia, Alternanthera and such. Looks the best to me, but everyone is different.
Using a mixture of only 6500 and 10000 is too green for me, that's where the pink bulb helps out.
That leaves us with the question what to do with tanks that only use a single row of bulbs. I recently switched my 10gal tank from AHS 6700K 13W bulbs to a single pink GE/AGA bulb. It is slightly overdriven (22 vs 15W nominal), so it appears a tad whiter than normally. First the tank looked really red, but it is growing on me, and now I don't want to go back to the yellow/green.
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