newb needs help from the RIU emergency room!! (pics and description)

differing strain tolerance to nutes. who knows......the others may start up. back off on them ferts.

seems the more Indica your plants are, the better they did. Indicas are tough.

possible issues:
combination of over nute, insufficient air flow leading to excessive heat causing heat stress. small saplings dont need much plant food or light to get started. The ones thriving are much hardier being able to handle the current conditions.

possible solution:
flush w/ph'd water(5.8-6.2), introduce a small circulation fan blowing directly onto plants which constantly need fresh air to help evaporate plant waste and helps strengthen their stalk/branches. adjust lights higher or evenly spread lights out. small saplings dont need much more than some phd water, 18-6 light, and constant fresh air to really get started, once you have about 6-7 decent nodes you can top plant in half take the top as a clone and give em a week. next feed introduce smallest nute dose, once they get a taste for plant food they want more to store in their leaves and grow mass kahunas

is RO water just a fancy wae of saying filtered water?(not the same but the outcome is ?) if it is! your plant is missing out on the heavier minerals you get in tap water , it also looks like a lockout maybe due to that!!! so get that and your PH sorted and give it a few days... yer wee plant should pick up... Happy growing........