please help????

[speero_m]

they are clones, 2.5 months from cut time. soil has slow release nuts. 2 4oo hps lamps. but gradually the color of most of the leaves of all the plants are turning to light green or yellow...any help....

 

[tango420]

Alot of people on here are anti time release soil. They might tell you to transplant into good soil. but to me they look like they are thirsty for some nitrogen. Are you using nutrients? if not get something with a higher first number then the 2nd and 3rd example 6-3-3. good luck