Can anyone tell me what this could be

[wizard122]

Everything has been doing better and now this. Not sure what I'm doing wrong. The leaves are turning a bit yellow on the edges Last watering just pH water 6.5 to 6.2
4 days ago today with food
Cal-mag
FF Big Bloom and Big grow
I hope it helps
Thanks

 

[dire wolf]

Hey wizard , post a pic under white light so we can see potential problems , you cant see anything under purple

 

[wizard122]

Hey wizard , post a pic under white light so we can see potential problems , you cant see anything under purple

Thanks for the reply. Here's my setup and more photos. The temperature has been a little high 80 degrees been working on that just added a fresh new air source from outside of the room.
They had a rough start but I'm not giving up

 

[wizard122]

I was thinking that they just needed some nutrients

 

[WankirA]

No expert @wizard122 , but looks like a mag def...
Sure an expert will be along but can see you have attended to it with your calmag, so imma nonplussed.
Be careful adding more nutes, not used before but ffof is already loaded so adding something could od your girls..
Good luck

 

[MIGrampaUSA]

No expert @wizard122 , but looks like a mag def...
Sure an expert will be along but can see you have attended to it with your calmag, so imma nonplussed.
Be careful adding more nutes, not used before but ffof is already loaded so adding something could od your girls..
Good luck

There is one piece of information that is very important. I would not add anything until we know what the soil pH is. Let's not automatically assume anything at this point. Mag lockout looks like mag deficiency. If soil pH is in range, then we can start talking about adding nutes.

We don't know yet. We could be adding plain water to try to wash out excesses.

Edit: what's my clue to that? The yellowing at the very tips suggests slight nute burn to me.