They look like your watering too much. Remember, the roots are obly as big as the plant maximum.... and obly take about half their body size in water each day. Lay off the water too much as you'll get fungas gnats or other pests or disease if your not careful.
Agree. And can second the PH values on fox farm ocean forest. You will not notice this until about week 4 of veg once the soil PH buffers take hold (peat moss in soil FFOF and oyster shells) as well as kicked back nutrients increase acidity(lower PH than 7). I reccomend 1 TSP of dolomite lime...