Hi! This is my first time growing. My plants are beautiful and around 4 weeks old. I haven't had any problems until today when i checked on them. One has a fairly large yellow spot with another spot on the three lobed leaves that is shiny and slightly yellowed. My other plant has tiny pale green spots. I did just top them about a week ago. It's still minor, but I want to know if it's something I should start to worry about?? Is it just a sign to start adding nutrients?