When you switch to coco your ph is good. For soil should be between 6.5 and 7.0 with 6.8 being optimal. You shoulf still have nutrients in the soil. Happy frog and ocean forest are good for up to 6 weeks. Although your plant does look ok now.
Just make sure you let it get light before watering and give it some calmag once in a while along with the tiger bloom and big bloom.
Check this for switching to coco.