RQS Quick One Auto

I planted the seed in soil on 19/10, the plant came out on 23/10 and she made her first true leaves on 25/10. Today 27/10, on day 7, she's popping out her second pair of leaves! Soil is the same of the bigger sister, I just addes some coffee grounds mixed to the soil and watered it with tap water and 2ml of root !t. On day 5 I gave some more tap water with no nutrients. My goal is to keep it grow like a bonsai in this little pot. I guess I should apply topping tecnique, so any advice would be appreciated.