cfl grow leafs turning yellow please help someone

hi my plants are 4 and abit weeks old now and when I checked them otherday there leafs was turning yellow on the edges I have been usin mircle grow is this the problem? I have switched to baby bio will this help someone please help my first time grow.... here is a video of my grow http://www.youtube.com/watch?v=ePZ7o4OZ-N8&feature=youtu.be

I agree with guy that commented on youtube, don't use nutes next couple times you water, and let the dirt dry out at least an inch down before you water again... The main problem people run in to with their first grow is doing TOO MUCH... It is called a weed for a reason it will grow in spite of you <3 Best of luck brother many blessings.

when you feed its nutes water nutes water nutes water and so on ect and i agree over watering is very common they like to be dryish, too much water and they drown and go yellow/crispy