Never used fox farm but has long has it has perlite in yes i use bio bizz, i used to mix my own up till i started useing bio bizz all mix the only problem with bio bizz all mix and any soil that contains feed is i would not advice useing it on realy young plants.But i was spending a fortune on all the seperate bits to make the perfect soil up but the plants love bio bizz..........tyke...............................................