About day 55 dark spots and crunchy top leaves

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New grower so pre apologies for everything
Dark spots on the upper leaves and they are getting crunchy, started at the top leaves and has moved down a little but bottom leaves have no spots or crunchy
Nothing rubs off of the spots so doesnt seems to be a fungus
About day 55 for Alien Moonrocks from Twisted Tree
LED lights set with PAR meter to 1100ish at the top of the tallest bit of the plant
3.9 gallon autopot with fox farm ocean forest , airdome in the bottom
feed has been mostly PH'd water @ 6.5 and 2 compost teas made from Natures living soil and molasses, 1 Tbls of each in a gallon of water, last one fed 5 days ago.
RH 45-48% usually
temp 70-80F range
Soil PH test showed 6.4 after flush , forgot to check before
I fed and watered all the plants in the tent the same and this is the one showing the problems.
My water TDS is 120 ish range and has been through a filter for chlorine and sits for a day before use usually
I flushed it yesterday with a few gallons of 6.5 ph water and am just letting it dry out a bit while I try to figure out whats up

Any help or insight would be greatly appreciated






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Feed her bloom nutes with cal/mag and see what happens. You could also raise lights a little.
 
Just a guess maybe to high a TDS maybe you have to many minerals they can accumulate in a small container. Maybe try distilled water for a few Waters
 
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