nitrogen abundance?

Need some help, ok plants been in veg for little over a month, had it on high strenght nutes was doing great. Then I changed out my res put same strength nutes back in and now some leaves are starting to fold and tips pointing down. I do not understand why this would start happening. Please help. I also poured out nutes and now am flushing with water.

If they are curling up like canoes, and doing a 90 degree downward drop at the tip then yea, its probably either Nitrogen or overwater. Same thing happened with me, i never flushed it, i just gave it plain ph'd water for a while, and lowered my nutes.

Is that in a hydro application?
What do the roots look like?