yellowing! Please help!

hi growers! this is my first time, just a little experience.
I start my seed on some sh*t soil. after midle of veg. i bought her some plagron royalty mix. i water her every 4-5 days. it on some fluo tubes an some real sun when possible. the single pair of lefs are gone, the next ones are almost gone and i start to see some light green on the next to pairs catching the first pair of fan leafs. Over fert because the soil or do i need some nutes?? Please help

picspicspics

Indeed^^......

here are some pics.

today i noticed that some of the yellow tips are bigger!
i also have yelowing from the botton and a short of curled under leafs.
i havent water for a week and did it yesterday.
pics one week older!

What can i do?

the plant looks good and dont worry about a little tip burn(i see in pic 4).
just give them less nutes next feed and they will recover.i have done this a few times before.
leave tip margins hooking or curling down=(overfeeding).
leave tip margins curling up=(windburn/lights to close).
tip burn=(close to overfeeding and if its associated with upward leaves its too hot).
Cannabis Nutrient and Deficiency Table
i know the chart shows you your plant has nute issues but if your using the right nutes i wouldent stress about a little yellowing of lower leaves or tip burn.
i have 7 fems 20 days into flowering and one of my plants lower leaves are yellowing but they are only fan leaves and dont really matter.its the bud sites you want and sometimes when i feed them some of the plants have leaves curl up at the end and other leaves on the same plant curl downwards??????.
but if i see slight burn on the tips i just lighten the next feed and all is good.
dont worry its going fine and the lower yellowing of leaves is perfectly normal as nutes are pumped into new growth.
read the health section on this page.
http://www.growell.co.uk/f/help/Help-and-FAQs.html#shop