pH of 6.0 will make your plants ugly I had a similar situation, my water (distilled+CalMg) was a pH of 6.0 and was causing my seedlings to ugly out quite a bit, apparantly below pH 6.5 the root system can't absorb the nutrients needed (whatever is in the soil) (here's a linky http://boards.cannabis.com/grow-faqs...u-can-use.html ). If I understand correctly, this can cause (at least in my case) salt buildup,general plant uglyness, and slow growth. I remedied this problem with some earth juice ph up. I used a seperate container to make a small amount of pH buffer (water and pH up), then added that sparingly to the water for the girls (use very small amounts as a little bit goes a loooooooooong way) and a good flush of the ugly plant.

Check the pH of the runoff, for me the only plant that had a runoff pH of below 6.6 was the ugly poor performer, so a flush was in order with some pH balanced water and this seems to have taken care of the issue.


EDIT: I checked C-I-L's website and they say the seedling starter mix is soil, perlite, and peat moss.