I would leave the plants be.
As for the bulb, its probably 5500K or higher then.
How many watts is the bulb? Does the light look white or yellowish in the tank when lit?
I buy the Reveal bulbs by GE at Walmart at 24 watts and shows 6500K on the packaging. Think the are about 5 bucks a piece.
Yours should be fine and if your plants are looking healthy then I would let be and let it grow on its own. Don't want to ruch anything since the sooner they overgrow the tank the soon you'll be either trimming back or replacing :-)