leaves turnin yellow

ok guys monday made my plants 6 weeks old and they are growing good and lookn so dank but the first little round leaves turned yellow and i plucked them off but now the next set of leaves is starting to do the same thing i would post sum pics but i forgot my camara also one of my plants is turning purple like the stems more towards the top and not just a lil bit like the whole stem all the way to where the leaves start to come out and now the leaves are getting a lil purple i dont think thats bad but i just want sum other peoples opinion. ill try to get on later but im leavn to go outa town Peace:smokin:

The yellowing sounds a lot like a Nitrogen deficiency. Some high nitrogen fert will take of that in less than a week. Unless your flowering, if your flowering than this yellowing is normal.

The purple stems are totally normal. This is just how some strains are. Nothing to worry about.

Have fun, and good luck