COCO COIR Seedling Growing: But!!! Old Leaves are turning brown and dry

[User624]

Good afternoon,

-I can't seem to diagnose what's going wrong with my auto seedling. The older leaves are getting brown and dry
-The humidity and temp ranges have all stayed between 70-80degrees Fahrenheit and 40-60% humidity (Which was higher at first when they were young seedlings).
- I have a ph meter for the water and I tried drying out the soil in case it was overwatered but I'm at a loss.
-The medium is a mix of soil and coco
-I also have a second plant living under the same conditions and it's doing just fine.

So I am not sure what to do? Should I remove the bad leaves? Is it a nutrient issue?

Who can Help!!?

[SoOrbudgal]

So i see 2 different pots same issue and in wood chip soil looks reused? Show the second plant, are they the same strain? Something in that soil mix is off is my guess. That one last pic shows all coco? It's not suppose to dry out just keep moist. That new growth in pic 4 looks OK. We like lots of plant info and growing enviornment lights, strain photo or auto. You gotta tell more info.

[Tersky]

Need to add perlite to aerate the coco/soil and provide drainage. Also what is pH? Not sure about a coco soil mix but coco is supposed to be 5.5-6.5 and soil is 6.0-7.0

[PLreef]

Add perlite. What's the PH of the feed water and what the PH value of the water runoff? Looks like you might have a mini version of nute lock out or just having PH swings.
The two folks that posted above me know their shit. Listen to them, they will not steer you wrong. Well unless you piss em off and then it's on you. Lol Good luck young blood.