Need HELP with diagnosing my problem!!! Noob

This is my first time growing and i cant seem to find why my plants are yellowing/browning on the leaves here are some pictures any my setup... Got clones from dispensary in rockwell cubes transplanted into soil. Havent used no nutes just straight water PH Is 6-6.5 when i water and Ph runoff is around 7... My Temp is always around 72% being the lowest (at night) and 79% (peak day)

600 watt MH light

lights are over 24 inches away

334 cfm inline blowing hot air out

12 Inch Lasko oscillating fan

5 gallon bucket

fox farm soil


Thanks in advance for any help

Looking at your soil I was gonna ask you if thats fox farm....then I see you wrote in ....so you know fox farm is a very hot soil for starters.....You should have gotton sunshine mix #4 the ppm is like 4oo fox farm is way too hot.....

Thanks man yeah its my first grow that was mostly recommended by my grow shop.. but i will defiantly try the sunshine mix #4.......but the soils just has to much nutes for the plants to handle?... is there anything i can do just besides no nute feeding for a few weeks?