Young seedlings do not need any nutrients until they have three set of true leaves. Looks like they are overfed, and they too early to transplant now.

Just give them pure water will do the trick.
cnd411 Reviewed by cnd411 on . First Grow & Worried.. :( Well here's some pics of my babies. :o I have 13, all the same size, 3 weeks old, do u think they look healthy enough to carry on ? They started life in my greenhouse, they are now indoors under a 100w lamp till we get our growroom set up in 2/3 weeks. They have had their first feed yesterday, biobizz biogrow. i wanna transplant them at the weekend, mainly to get rid of all that stem, they gettin top heavy ! any help would be much appreciated ! :) Rating: 5