White widow . . . 1st grow ever

HI I AM GROWING 1 WHITE WIDOW PLANT FROM SEED.

I GOT THE SEEDS FROM http://www.cannabisseeds.com/ 12 FEMINISED WHITE WIDOW SEEDS FOR £10.

I started by germinating the seeds using the paper towel method and surely enough after 24 hours the seed sprouted.
i planted it in ordanary potting soil and watered it regularly.
the plant has been growing for three weeks now under a 100 watt bulb in the grow box i made.

so far the plant is healthy but there is a brown discouloring to the lower leaves whitch i think is due to nutrient defficency as i have not started using nutrients yet as they are still in the post.

any help will be much apreciated :)

<< thanks , here are some pics of my grow box and plant >>
 
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