Leaves turning Brown/yellow early veg

Lockout due to too high nutrient content in the soil, creating high osmotic imbalance and preventing the plant roots from absorbing water. Easy fix is to add 5-15ml of just plain water or an extremely diluted nutrient mix to the base of the plant to locally flush the tap-root of excess nutrients. My goto formula for when that happens to people and I need to help is: Mix 1 teaspoon (5 ml) of piss to 200ml water (or just give plain water if you are not into feeding your little pissloving plant piss.). Give the bottle a good shake for 30 sec to increase the oxygen content. Feed the plant 5-15ml of the mix, close to the base of the plant and avoid hitting the leaves. Then add paper towels under and around the pot, touching the bottom soil of the pot to draw out any excess water. Plant bounces back within a week!

It will survive if you don't feed it for another 2 weeks or so,....the damage is caused by giving too much food in a soil mix that already has enough nutrients........basically, they are burned. Baby plants should not need any feeding for the first 2-3 weeks if started in quality soil mix, including root booster, micro stimulants etc. Once you do start feeding, quarter to half strength is usually enough for baby autos. Remember too........it is very easy to remedy a slightly under fed plant, but very, very hard to rescue a burned and damaged over fed plant.

I would say the opposite, DO NOT FEED lol. I think adding the bat guano to your premix soil made it a little hot. Nutritional needs at this stage of growth are pretty light, especially in autos.

needs a feed mate