Help me please. First time in rockwool

[jb420710]

The spots on the tips of these are only on the OGs I have in the front . The strains in the back the leafs tips are burnt a little and curling down with slight discoloration . I’m running advanced nutrients with elite 91 full line up. Ph is 6.7 . I don’t have equipment to measure ec or ppm

 

[RealizedReal000]

Isn’t rockwool supposed to be like hydro? Don’t you want the ph to be lower? Like 6.0? I’m not a rockwool user so hopefully someone else chimes in.

 

[jb420710]

I’ve heard a lot of different answers for what my ph is supposed to be .. honestly have no clue