Hello Myzkilla,
If you give what you are using like Medium, Nutrients, RH, lights, and anything else you can fill us in on, There are So many Good People out here that can Zero in on what you issue is, Just by looking at the leaves won't give any real info. I could say they look really Dark Green and over Nitrogen but I can't do that not sure what you are using.
Give the info and get some help before it goes to far.
Welcome to RIU BTW..