Crisping/burning

Had a look around and could not find a pic with an explanation to cure the problem I've got so had to make a thread. Not sure what's wrong with my babies. They aren't even a week old yet. I just started a new grow I cleaned/bleached all my kit so it's all clean and my previous grow didn't really have this problem so no chance of cross contaminationView attachment 2388179View attachment 2388177

I've got all my babies in 2 different amazon aeroponic units and it seems to be affecting babies from each unit. Only some plants in each unit are showing these signs and some are showing no signs. any help appreciated

thanks

Looks like possible nute burn. If they're babies it's def possible. Are the burnt plants less developed than the healthy ones. What's your ph? It should be @ or close to 5.8

First step to solving plant problems is usually a flush. Try replacing all your nute water with regular water and flush for a day or two...then change the water again and add back some nutes. try 350-400 ppms next time and see it it helps.

Also after you flush cut off the burnt tips. Then you can easily see if it's getting worse. Hope that helps.