http://www.akvarijum.org/forum/uploa...Mar15_2010.jpg
Looks like K overdose or Calcium/Traces deficiency.
Miracle grow doesn't work for hydroponics. It is designed to supplement things that are generally found in soil so it will be really off balance in a hydro system where you don't have the things found in soil.
Check out this youtube video where someone tried 3
nutrients side by side where one of them was miracle grow. LOL
https://www.youtube.com/watch?v=dvcqd5zgTh8
Hydroponics is chemistry. You have to do things right or you end up with "lock out"... compounds that plant roots can't absorb.