Fish emolsion

My plants are only in week two of flowering and suffering from nitrogen deficiency bad. I have fish poop. Will that give them the boost they need?

We could really use pics to tell see if it isn't some other kind of deficiency or lock-up causing your problems. But yes, fish emulsion is great. I used the cheap Alaskan Fish emulsions sold at home stores and it had my plants shinny green.