Burnt Edges, Yellowing, and Spots. Help

On my third grow, Durban Kush clones, srarting week 6 of flower. Issue showed up about a week ago. Growing in happy frog soil, 5 gallon pots, 2 X 4 x 6 tent. Intake fan pulling from the house, exhaust fans venting to the garage. Circulating fan inside tent. Lighting is homemade with 2700K LED's. 270W pull from the wall. Feeding twice a week using fox farm trio on schedule.

I was running the ph a little low (5.5 to 5.9), flushed a few days ago. Runoff still a bit low at 5.6. Went to half dose but feeding normally now. Does'nt seem to be clearing up. Any ideas?

looks awesome for 270 watts. I'm guessing transpiration out of my ass.

I havent used Cal Mag before. Ive only used to three nutes. How Cal Mag does it typically need?

A good rule of thumb is half what the bottle says,so 1ml/L is good.

Thanks ill that a shot. Sure dont want to lose these.

Remember FF feed schedule is only a guide. Those numbers given can be way too much on plants.

When I ran them , I stuck with Tiger and Big Bloom ( only organic of 3 ). Your leaf is showing some K issues probably from ph swing.
So that element gets deficient. Happy Frog runs about 6.3 ( bump 6.5-6.7 ) Give them flowering girls the PK they want.

K deficiency can mimic “ burn “ but always shows yellow margins ( serrated edge ) and then browning.

Thanks for all the replys and the help. I picked up some cal mag but i dont think im gonna use it. Im on tap water thats pretty good and havent seen much need for it. I think K deficiency might be it. I did another light flush and added a bit more bloom to the feed. Only got one more week before i final flush.

garyinok said:

Thanks for all the replys and the help. I picked up some cal mag but i dont think im gonna use it. Im on tap water thats pretty good and havent seen much need for it. I think K deficiency might be it. I did another light flush and added a bit more bloom to the feed. Only got one more week before i final flush.

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They have a need for extra cal mag about 4-5 weeks into bloom.

if your that close to flush dont worry about it and dont give them anything else but water. looks like nutrient burn to me

Thought I would give an update. Got them through to harvest. Thanks for all the comments and help gang. This one was a tough grow. Turned all kinds of yellow at the end.