Indoor My plant is dying need help please !

[Inspired]

Since 3 weeks, my plant has been going to some stress, I've been told LED was often associated with cal/mag nutes so I added some.
But it seems like it's dying a bit more everyday.
It's in 15L air pot and I think I might have done something wrong with my watering.
Temps is 25 light on/20 off
50-65% RH in the room
No fan so I'm opening twice a day.
No idea about the PH, I ordered my meter but it hasn't arrived yet.
Please help me, I'm almost sure it's because of watering.

 

[Muddy]

All and all it looks pretty healthy. It's not unusual to lose a few of the bottom leaves as they are often shaded by the rest of the plant. I do see a little curling along the leaf edges and a slight discoloration which could be early signs of a K deficiency. But since you don't know your pH, it could also be the beginning of a nutrient lockout if the pH is off. You also don't mention what you are feeding, at what strength and how often. That would be useful to know. Once you get your pH meter you can check it and then we'll have a better idea where you're at.

 

[greengherbs]

How often are you watering? Night temps are on low side maybe, and are you warming your water before feeding? So it could be ph lock out or it could be lock out from cold. But she is starting to show signs of hunger and looks slightly over watered :smokebuds:

 

[Inspired]

I water once every 2 days and I've been giving organic teas baught at my local store

 

[smith4924]

also you mentioned that you have no fan. Though opening it up a couple times a day may give some new fresh c02 it may not be enough for that large of a plant where as it might be fine for seedlings.... just my $0.02 looking good though man

 

[Muddy]

That's likely too much. Weed likes to go through wet/dry cycles. Get a feel for how heavy your pots are when they are almost dry. Only water/feed them when they feel that way.

I water once every 2 days and I've been giving organic teas baught at my local store