Cobbler Crisp

Hello mate, i agree with others growers here, you should never use an heavy soil mix for the gemination or plantula phase. The plant isn't ready to take nutrient from the soil, you should also reduce the amount of water for this little one, she definitely don't need it so much. Last tips, if you really have the pH solution at 7, try to bring it into range 6.2-6.5. Good luck and happy journey!

too heavy soil... just try a light mix and for the first 2/3 weeks or so you generally don't need to add anything else

Too young of a plant for hot soil unless it's a big pot and you layered the hot soil pretty deep.