Help on yellowing leaf tips

Ok a few days ago some of my leafs are yellowing on the tops on the tips on a few plants and a few curling leafs.They are 21 days old .Does this look like over nuted.

flushed with plain ph balanced water .
ph is at 6.8

you took the right action, I don't like your PH at 6.8, I would advise you to move it closer to 6.0 and they will be happer.

Peace

PS Don't believe the instructions on the bottle start out at 20% the recomended and move up from there as they get older.

So you think the ph is to high most of what i have been reading says 6.5 to 7 in pots....


https://www.rollitup.org/indoor-growing/8595-how-measure-ph-your-soils.html

Nah I would keep the pH at 5.8-6.5 trust.