Wat are the temps bc @ that stage for me using led 90 ambient temps seem to make it grow much faster now I do have a good amount of air movement but remember the leaf temps should be 80 to 82 that's the key alot of times seedlings pop with a minute amount of a calmag deficency or just a slight mutation if it continues past 3rd or 4th node that's when I would be trying to figure out wats going on with it if you have ? or anything ever tag me I will do wat i can to help bud it's no problem