Doubtfully the soil as you've made it this far, the plants look like they're autoflowers possibly? Looks like they may be closing in on the last of their life cycle? Leaves usually tend to start fading out once the plant reaches ripeness & maturity in bloom.
Seriously though look for something other than Ocean Forest the only product I know of from Fox Farm that seems consistent is their Happy Frog blend. Personally I avoid Fox Farms like the plague its known to bring in larvae of bugs and have horrible PH issues that even a large array of microbes can't cure.