How big is the tank?
4x54W is probably the max you want to use on a 4 foot tank.
6700k-10000k bulbs generally look nice. Not too yellow and not too blue, but it depends on the manufacturer. People claim that is the only range that is good for growing plants (it's not)
I've got a 3x54W fixture and usually run a 6700k and a red plant bulb. I like the color, but I don't think it makes much of a difference in growth.
Giesseman bulbs are supposed to be really nice, aqua-flora and midday.
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