is this nute burn? other plants in the same res are fine.

[Tokist]

i have seven plants sharing an 18 gallon dwc container. sex unknown, they're just some bagseed.

the solution in the res is a really weak serving of gh nutes.

only one of the plants is affected by whatever this is:

there's another plant sharing this same netcup and it does not exhibit the same symptoms. the newer leaves are starting to show little black flecks at the tips. the older leaves get dryer and yellower and generally deader by the day.

some of the other plants in the solution have mild nute burn at the very tips, but have not shown any problems beyond that.

does anyone know what's going on here?

 

[Tokist]

today the other plants started to exhibit the same symptoms. suggests it's a res-wide issue. checked ph and it was way too high. lowered down to 6. hoping this fixes the issue in a timely manner. next question is why would one plant exhibit signs of low ph several days before it affects all the other plants?

 

[Grand Daddy Purp]

Simple answer is that that plant is weaker than the others if it came from the same buds as the other seeds or it could have been drinking a lot more than the others because it was the strongest and thus showed the problems first.

 

[Tokist]

makes sense to me!

 

[WizHigh]

Plants are different in there own way. What you give one plant might not be good for the others. All plants react different to the dosage and what type of nutes you give them. I would say it looks like a calcium problem. What type of water are you using? And also it look like a salt build up. You would have to filter your water or add camg+ to the water. And foilor feed until the problem clears up. Get a fresh solution and do you have a air pump in your hydro?