Hey,
Personally i would not give it anything at the moment, i have 2 babies around same age 🤣 and i only give them water. After 2/3 weeks i will slowly introduce nutrients. If you really want to lend a helping hand you can give it some root nutrients ( a little goes a long way when diluteing, seriously )
I see your lights are 70cm pluse, mines are at about 35cm from top leaf. You can check my gorrilla zkittlez auto diary and see the troubles i had in the begining with lights, you can really see difference between the plant without correct light and the 2 with correct lighting from beginning. It's an LED so it can be close but not to close because you do want it to grow in height and not get burned leaves as well.
Hope this helps, happy growing.
If you have any questions feel free to DM me happy to help 😉