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this is my first time on here and was wondering if any body could help me out,what kind of deficiency is causing my seedlings leaves to have yellow edges,the plant is sending out its third pair of fan leaves,at this stage should I feed it nutrients(If so what kind?)I heard 20-20-20 is a good balance for vegitative state?

you don't give us much info so it's hard to help ya...but yellowing edges is not a sign of nutriant deficiency...most likely it's from overwatering which is the most common cause of probs for new growers. cannabis doesn't like sitting in water all the time (unless you're going hydro which is a whole different area and i won't be discussing it here or anywhere cuz i do soil only). but soggy dirt is the number one cause for failure during the 1st month or so.

as far as ferts...wait until they're about 3 weeks old then dilute the mixture by at least half (1/3 of what directions call for is best until you get to 'know' your plant...iow, if directions say 1 tablespoon per gallon of water, cut that down to a teaspoon or 1/3 to a gallon of h2o). high N of the NPK is what you're looking for during veg...high "P" is what ya want for flowering.

good luck

and next time tell us more about your grow...lights, soil, ferts, etc...we'll be better able to help when you have questions.