Its seems fine, im using it now and slowly switching over to botanicare..
HeHe...I ran out of Botanicare and had the fox farm trio and the solubles, so I have used them now for a while. Can't say anything bad except for the salty crust around cap tells me to be very careful...never more than half strength...get a ppm pen I do not go over 1000, but usually 750-900.
Botanicare I used half strength every watering, but FF I do EO, with a dilute tea as my base @ ~180ppm (plain (ph'd) water only for flush for me usually)
I have heard lots of good stuff about age old here and in veggie growing boards/Mother Earth News, and am thinking about giving it a try cuz the FF is not organic. And yes the Tiger Bloom is SUPER acidic. It is supposed to increase shelf life (nothing would grow in that shit). I use it along with a healthy dose of pH up. Big bloom (1.5Tablespoon/gal) and Grow Big (1 tsp/gal) together seem to balance each other out for the veg nutes, but the same mix sub Tiger Bloom for GB knocks the pH down in the 4's!