Crap...took too ling to edit.

Anyway, FF is notorious for it congealing salts, but monthly mini-flushes (1 or 2 times the pot volume, or so) releases them. After every flush, I add Soil Syrup to the soil. (humic acid) Roots love it, plant thrives, lol. Is a great combination, IMHO.

If going with the FF system, there is no real need for the solubles. (Cha Ching, Beastie Bloomz, and Open Sesame) But If you do get the solubles, go real light with 'em. They can overdose the plants quickly if not real careful. Can create lock-out overnight. The only FF soluble I've used is the Cha Ching for late-stage trichome development, but jury is still out as to it's effectiveness.