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With regards the call for comments on 10,000K bulbs: I tried a 10,000K
bulb a couple of years ago, and had very poor results. This seemed like a
good idea to me too, but it didn't pan out, at least for me.
The tank was an 18 gal tall (20 in high) w/ two 15 W bulbs. Though the
amount of light was on the low side, I got respectable plant growth and
"in-control" algae with both 1 Vita Lite + 1 Cool White, and 1 Vita Lite +
1 Coralife Nutra Grow. When I changed to 1 Vita Lite + one 10,000K
(Coralife) bulb, the plant growth became very poor, and the algae (esp.
Black Brush algae) became rampant. This went on for a few
months. Finally, I removed the 10,000K bulb, and in a few months plant
growth returned, and the algae subsided (slowly). As far as I know,
nothing else in the system changed.
Though I didn't make the connection at the time, in retrospect I attribute
the problems to the 10,000K bulb.