In my experience the black gravel/sand really doesn't do a tank justice. White or natural aragonite is much nicer, it reflects a lot of light and makes the tank look much brighter. A 10k tube won't give you the nicest colour and your desk lamp will be washing out most of the colour the 10k is giving you if it's a normal light bulb. There are a number of upgrades you can go with for light over your tank, depending on what size it is. A 10k and an actinic will go a long way or two 50/50 tubes (actinic/10k on each tube).
Congrats on getting involved in nano's you'll love it.
Doug
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