oldest leaves yellowing

my plants are a little over two weeks old. The oldest leaves are yellowing and turning brown.

i thought it was the heat because i have em under a 220 watt. so i moved the light up and added a fan it seems like the leaves are getting worse. also i checked and heat damage would be the top leaves and these were the bottom most

off the top of your heads any ideas what it could be? ill post pics later

how bigs your grow room

not big in my walk in closet. the plants are between two and three weeks old. they are in solo cups under a 220 watt CFL.

it cant be any nute deficiency yet right? i havent fed them once yet but it takes longer for deficiencies to show correct?

Dr.daddybone said:

not big in my walk in closet. the plants are between two and three weeks old. they are in solo cups under a 220 watt CFL.

it cant be any nute deficiency yet right? i havent fed them once yet but it takes longer for deficiencies to show correct?

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Nope, right about now is when they begin asking for food. It may be time to start feeding now, 1/4 strength at first, then work your way up until you see signs of nute burn then taper down a bit.