using ff tiger bloom, its npk is 2-8-4. its safe to use 1tbsp - 3tbsp per gallon of water. i recommenced using 3tbsp ever other watering.
if you use 1tbsp your getting a nute mix of 2-8-4, if you use 2 tbsp your getting a mix of 4-16-8... get it? you don't want to cross 25-25-25 ever, just take my word on that one hahaha. also i read that most people use tiger bloom, also use something else to supplement the extremely low N levels. i know for a fact marijuana loves K more than anything.
personally i use the cheapest most balanced stuff i find:
-shultz rose food@3/4 strength 18-24-24 (at 3/4 strength its more like 13.5-18-1
-mg@3/4 strength 24-8-16 at 3/4 strength its more like 18-6-12)
-when you use 3 parts shultz and 1 part mg; you get an almost perfectly balanced mix of 19.5-20-22 (my personal favorite)