Thanks for your reply Will!
So, it's not in its plastic nursery pot anymore, I repoted it 2 to 3 weeks ago and I put it in a higher one (made some holes in a bucket that I had here, put some rocks on the bottom for dreinage and also to take some of the size of the pot) so, actually this big pot is just a little bit bigger than the size of the plants roots.
About the light, it is in my balcony, facing north west, so it gets a lot of bright, bright light. I live in Brazil, close to the beach and for that I have a lot of humidity!
As here I have a problem with fungus gnat I put sand to cover the top of the soil, so I use a toothpick to see the need of water, inserting it into the soil and then seeing if it came out dry or dirty.