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im kinda banking on maybe slight nitrogen defic. but not very sure. bottom leaves are yellowing and have 1 or 2 brown spots on them. it is only 15 days old. any insight would be greatly appreciated. To all of the more educated ones on RIU, i have read the stickys but would like a personal...

If you couldnt have guessed it already im new to growing. my current setup is a 2' t8 flourescent with 2 17w bulbs, one bright white, the other cool white. space is 2'x1.5'x3'. just planted seed today. will the lighting be enough to sprout the seed and how long could i make do with it?