i got hydro green crack clone at the club

okay i have green crack clone that's 1 month 2 week old win i went go buy it they where in those hydro blocks not in those red party cups .... there in soil rigth and now my middle leave are ligth yellow and bottom leave are yellow could this be why there turn yellow b.c it in those hydro blocks and they are real skinny?

They probably need fed. Be careful with the blocks, probably rockwool, real easy to over water. If they get saturated for too long, root rot (pythium) will come to visit.
Fred