What breeder did the seed come from? Is it from HSO? I grew out an og from hso and it was daaaank, and a good yielder too (which is kinda rare for a straight up og kush).
Honestly, I wouldn't start feeding for a couple of weeks. Seedlings have some stored energy in them anyways, and if you are watering with tap water they should be getting some calcium and magnesium. Don't be in a hurry to start feeding, bc you can wind up cooking your plants pretty quickly and slowing your growth down.
HOWEVER, I heard this from a fellow member and he was totally spot on, even tho he was growing reserva privadas og #18. He tolde that it's really like to drink up the nutrients. Which honestly, you shouldn't have to worry about until flower.
Mine started getting deficiencies in early flower, and I wound up having to transplant (in flower, which you never want to do) in order to help take care of the deficiencies.
So in conclusion, dont start feeding for at least another week or two, and when you do start feeding start small, with half strength or less. Work its way up, get a TDs meter so you know how strong your feedings are, and when that og gets to flower try and push its limits with the nutrients.
Good luck, hopefully yours turns out as well as mine did
