seedlings and clone will yellow on you as it is a def. but they have not developed a strong enough root system to start feeding them. wait tell they are about 2 or 3 weeks old then feed 1/4 to 1/2 strength nutes.
I like the Alaska Fish Fert from Wally world works wonders but stinks to High Heaven
Plants lookin good Keep up the good work not to much attention (Dont over love them ) and you will be smoken some of the best that you ever had
Happy Growing
Green Dave