I have used ff and it worked really well, but i did run into a problem ....every strain will react different... I followed the feeding scedule but when i add the micro nutes beastie ,open sesame and cha ching i noticed that i was burning some of my plants....so as some one said earlier start small and work your dosage up ...i have to use a 1/4 mix on the stain im growing or ill burn them up, but other then that it is fine for me...but that works for me and everyone is set on there own nutes.....good luck