Fox Farm Big Bloom is great stuff, but NOT a nutrient like grow big. (I consider it more of a tea than a nutrient) You want to use Big Bloom along with Grow big or some other veg nutrient. See how low the nutrients are in Big Bloom? Your plant will starve if fed this alone
Note the big zero on N for Big Bloom. I cant say for sure you have a N deficiency, but I'd bet money that adding a little N will get your leaves to green up. (or to stop yellowing)
BIG BLOOM® LIQUID PLANT FOOD
Crafted For Organic GardeningTM
0 - 0.5 - 0.7
GROW BIG® LIQUID PLANT FOOD
For Lush Vegetative Growth
6 - 4 - 4