Hello guys, i'm not sure if it is the right place to post this, but it will do, because i need some help. 
So, i'm with some trouble on my grow room, this is the first survivor on a second growing.
my little baby has little dots on end of leaf.
i tough this was Potassium, so i gave her a little bit of NPK. she grew up a little bit, but the dots keeps appearing.
so i tough it was calcium, i gave her a bit, and nothing changes.
anyone has a clue?
p.s: rocks on top are perlite

So, i'm with some trouble on my grow room, this is the first survivor on a second growing.
my little baby has little dots on end of leaf.
i tough this was Potassium, so i gave her a little bit of NPK. she grew up a little bit, but the dots keeps appearing.
so i tough it was calcium, i gave her a bit, and nothing changes.
anyone has a clue?
p.s: rocks on top are perlite