If you look at the top of the leaves they look blistered. I'm thinking light is to close.
Leaf tips curling down. To much nitrogen not a lot but more than the plant likes.
Brown tips are classic excessive salt buildup in soil. Cause over feeding.
Plant leaves look droopy in general. Watering to often.
I'd back the light way off or turn it down buy at least 25%
You say you gave it some
Fox Farm Nutrients.
Witch one?
How did you mix it? How much water how much nutrient did you add.
I'd like you to stick your finger at least 1" deep into the soil and feel how wet it is.
This is your key. Do this every day but do not water again until you feel the soil is quite dry 1" down.
Don't worry there will be plenty of moisture deep in the pot. Your finger will tell you when it's time to water again.
Then give it a good soaking. Let some water run out the bottom and away each time you water.
If it is your intent to use
Fox farm organic nutrients with the Sohum Living Soil for the entire grow.
Transplant into the largest pot you can. At least 5 gallon as soon as possible.
Invest in a bottle of Fox Farms Bush Doctor microbe solution. Add 2ml pr L of water once a week when you deep water and feed to keep your soil life abundant enough to utilize the nutrients your adding.
This will get you off to a good start.
Do you have flowering solution yet?
Nutrient chart for feeding.