Never used Sunsun LED before, not sure if it's good.
If already using new GEX soil, then no need root tabs till a later date.
5 days is a relatively short time to start worrying, especially for dry start. Leave it as it is if the hair grass is bought from LFS in emmersed form. You have another 30-40 days more to go before flooding the tank.
Make sure to mist the tank twice a day and seal 95% of the top of the tank, leaving a small gap.
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