The curled down leaves are the cotyledons and that's natural. All I see is it's a bit leggy, but not critical. Your lighting height seems right and intensity for Mars Hydro TS1000 should be 25% at this point. If it gets more leggy, add some soil around the base, maybe covering 50% of the long legged trunk. A very gentle breeze from an oscillating fan will help strengthen leggy trunk! Cheers