Thats a pretty little plant OP.
My tips are
- to feed it less if you want to keep it small - water down its nute solution and only give it just enough to keep it green.
- put it in a smaller pot, to do this you have to trim its roots down - this will slow down its growth massively, you can also shape it and cut off some growth tips to balance out the size of the above/below ground growth when you do this
- grow it under a few piss weak CFLs which will also slow it down.
Here's a few pics of Kaya, my first termed ganja plant. Turned out to be a male and got torched, but he was almost 3 months old, less than 3 inch tall and had 8 tops after being mainlined...
View attachment 3352784 View attachment 3352783
Have fun!