Welcome to the life long hobby! I have been making soil for so long I didn't know that Fox farms came out with a new soil. Last I knew was ocean forest. I know nothing about strawberry fields aside from the quick info I just found on foxfarms.com. That being said, I'd assume it's not as "hot" as Ocean forest, probably more like happy frog but with a few more goodies. If your soil was hot, your seedling would look pretty beat up as too much fertilizer generally is a bad thing, even if it's organic.
Make sure to transplant into a larger container. I've had some seedlings in the past that outgrew their solo cup quickly. The roots need space to spread out and if they've outgrown their current pot and stay in it for too long, this will cause nutrient issues and you'll have issues with your plants wilting, they drink very quickly and dry out.
If your checking pH, 6.5 going in and then you need to occasionally check the runoff. To do this you allow the first 1/3 of the volume you poured in to drain away. You don't want to take a sample from this. You want the end of it, the last 1/3. If you have plans on fertilizing with liquid nutes, which you will, that soil mix will not carry you to harvest alone. Your going to want to pay attention to the ppm or EC going in and when you test the runoff's pH, you test also for ppm/EC.
If your using tap water check your taps pH and sometimes you get lucky depending on the brand of liquid nutes, you don't have to adjust pH, it's always ideal. Also get Google your municipality water report, it will tell you everything you need to know about your H20 quality. If purified water your going to need a cal/mag additive or add dolomite lime to you next transplants soil before the planting.
Let the soil dry out in between watering. Not bone dry but the roots are encouraged to grow in search of water. Bigger roots, way bigger yields and size of buds.
Good luck and welcome
