First grow, green to yellow to black fading help!

I'm not too sure what's going on its my first grow but I've done my research. So I thought it wasn't food problem but I thought I would lower their food concentrate about a 1/4th, but the problem seems to persist. Anything helps any ideas?

Thank you!

Nitrogen deficiency. What soil or medium?What feeds were/are you using and how often? Lights or outside?Increase your feed 1/2 strength and feed.

Needs more food. Yellowing is a sign of starving. You want emerald green. If your in soiless you need to feed every watering. Soil can be fed every second or third water.

I agree with hotrodharley and alienwidow. She's feasting on herself to stay alive. Bump up your nutes some and she should recover.