Yellowing Leaves and Brown Patches :( ?

I have 2 plants of the same ages give or take a few day and one of them had to much miracle grow i think so the leaves started to curl so id been giving it water all week but now its started to yell and has brown spots i think its dieing how can i make it green again?? Also its growth has really slowed down :S

If you need set up details:
Northen lights Female Autoflower from seeds
Week 5 of veg
3 CFL Lights 15watt
Nutrients: Miracle Grow Organic

Please help my other plant is fine though :S

You say u have been giving them water all week??Thats prob.why..

Yeah, Either the miracle grow nutes or too much watering.
Doubt it's the MG nutes since that's what you've been growing it with.

Yeah the one thats Sick has only had water all week so i need to give her Miracle grow again now yeah?

2 plants under 3 x 15w bulbs ? do u have picture of set up
what are your lights on 18/6? on week 5 u should be in flowering with autoflower seeds

I can't really say as that i've heard MG isn't formulated for MJ growing..sorry.