flourescent green

I have 2 plants indoors under flourescent strips about 3 weeks into growth 1 PPP & 1 early girl. I noticed this evening some edges of the leaves on the early girl have gone a bright almost flourescent green, any advice please.

pics please

i believe that is the start of nitrogen deficiency.

I want to add a picture of my plant but don't know how to load it. on here it asks for url of my picture and I don't know what the hell that is, I'm only used to uploading pics by browse then uploading from my pictures, help please

click on manage attachments, your picture will be the attachment

Thanks for your help, hope these photos as the camera is a bummer

as extra info I just started feeding the above with 1.8 ml per litre of Sensi grow part A & B also 1ml per lire of seaweed extract. the plants are 3 weeks old and look healthy to me apart from the light green on the early Girl leaves but this is my first grow so I am no judge.
I would like to take cuttins from the ppp but it is so thick and bushy I'm not sure where to start and frightened I'll damage it.

I only saw one leaf that was damaged,are you sure that you havent just spilt some fluids on that leaf?
If not use a light spray,according to the cannabis deficiency table anyway,of
MOLYBDENUM (Mb) Yellowing of middle leaves. Foliar feed with chemical fertilizer containing Mb.

Thanks lads for your help. I've taken the plants from under the flourescents and put them under a sumaster cool deluxe M/H 600w and they are thriving under this.