New Grower Too much light? Too much nutes? Not enough nutes? Confused! Need advice please.

The Green Goblin

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Hi!
:)

I'm new to the growing scene and I noticed some yellowing on some of the tips of the leaves on one of my autoflowers.
I have a 1m x 1m x 2m grow tent with a Fecida cr600 (125w) led light. I also run an extrator fan and I have a small oscillating fan running on the floor of the tent. I run a 18/6 light schedule.
I have 2 plants growing in coco coir 75% perlite 25% mix in 2 x 15 liter fabric pots.
The nutes I use are Coco A&B , Rhizotonic and Cal Mag
I am growing one Y Griega CBD plant which seems to be doing really well and a mystery plant which is either
a. Blue Dream Auto
b. Kush n Cookies CBD or
c. Expert Gorilla Automatic
The seeds got mixed up and only one of the 3 sprouted but which one I'm not sure.
Anyway it's the mystery plant that has yellow tips appearing on some of the leaves.
Both plants are on day 25. The Y Griega CBD is 18cms tall and the mystery plant 12cms tall
I had the lights at 60% output 50cms from the plants and I noticed some slight burning on some of the leaves so I raised the light to 70cms, still at 60% output
My feeding regime is a bit unregimented but I feed them both approx 1 liter of water each with 75% recommended dose of nutes each per day and I also foliar spray the leaves with rhizotonic 2mg per liter and calmag 1mg per liter once or twice a day. I always check the ph is at around 6. Humidity is always between 45 - 65 and temps 21-24 degs.
The first 4 photos are of my mystery plant and the final 3 photos are of my Y Griega CBD Plant.
So any advice will be gratefully accepted and also if someone could identify my mystery plant that would also be great. One other question, in photo no. 7 are they the dreaded nanas I've been reading about appearing?
Thank you. 1 Plant 1.jpg2 Plant 1.jpg3 Plant 1.jpg4 Plant 1.jpg5 Y Griega CBD.jpg6 Y Griega CBD.jpg7 Y Griega CBD.jpg
 
You should be adding cal/mag to your feed water at 1 tsp. per gal.Do not over feed to avoid nute burn and your close now with the brown tips.other than that they look ok.
 
Thank you namvet25, I wasn't sure if the tips were due to too much light or too much nutes. I will add calmag and keep an eye on it. Appreciate the reply! :biggrin:
 
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