plants sharing same nutes different results ...help

i just got 5 clones 3 days ago ... 3 are doing good but 2 are dead. they just went limp ....now how could this happen if they are all in the same DWC bucket recieving the same nutes the same light everything is the same ... so why did 2 of them die ? sorry i dont have pictures but if i did you would see 3 healthy clones and 2 dead ones ...ph is 5.5 - 5.9 ppm is at 200 ... Anybody ?

Were they all from the exact same plant? any of them closer to a light or fan than others? Limp clones normally means humidity isn't high enough.

they were all the same distance from the light and my humidity is high at about 70% ..