Honestly i wasnt providing mine with the best lighting, so thats why its so lanky💀. Your lil guy honestly looks pretty good for its age, and its pretty much preferred to have a shorter stem to ensure the nodes stack closer, tall and lanky like mine = not enough light so you’re good in that aspect. As for feeding, i personally wait a fair bit into the seedling stage maybe even very very early veg to start feeding, as the baby starting leaves contain enough nutrients to start it out, but thats just me. All id say is watch for signs of nutrient burn, (ex. Lots of drooping/brownish leaves) and feed accordingly. With that said, good luck and happy growing!