12 days in and still yellowish and a little burnt

12 days old still yellowish and a little burnt tip

It seems you could have a few problems here. One you could have poor drainage. Too you could have over fertilized and watered. I usually put small pebbles in the bottom of my pots. I'm growing Veneno now. Also TNT Kush. My Veneno is 2-1/2' tall. I put it in the flowering room at two months, 10 days. It has taken off great. First time for me with Veneno. You have to be patient with watering. I also fimmed my Veneno and TNT Kush. It helps on some plants to bush them out more and get two more branches at the top.
Good luck. Stinker.

I forgot to tell you it's also important to make sure you use distilled water. If not you can dechlorinate you own by added one teaspoon of hydrogen peroxide to one gallon of water. I use to use a fish pump in a 5 gallon bucket to aerate the water to de-chlorinate.

I'm with stinker. I believe its over watering due to low drainage. Also is that just dirt outta ur yard bro? It just kinda looks like it in the pic is why I ask. Give em a little bit more time between waterings, pick ur pots up every day or so and feel the weight. When it feels light water em. Pick em up a few times after u water and get use to that weight, after a little practice u can basically tell by weight where all ur moisture is. If they don't get better after the soil dries I would repot with added perlite, sand, or something for drainage. any ?s feel free to ask or PM bro. I have a veneno almost 8 wks into flower. Check out the grow in my sig, I promise u don't wanna lose her cause she will be some DANK. Peace