My leavs on my cheese plant is curlin up and drying helppppp

I have 3 plants about 3 weeks old there cheese plant now 2 of them had yellow leaves on them so I cur them off and 1 has gone back to it's normal self and the other is starting to curl more and starting to fell dry can some 1 help me there on hydro and rockwool I can't put a photo on

Just the tips of the plants areyellow

Post some pics.

slap the hand that cut your leave off, it'll just accelerate it on the other leaves quicker. You gotta fix the deficiency, do some googling.