I've had a few pepper volunteers come up in my seed starts. They're happy little accidents, at least for the time being. Hopefully they wind up producing. Past results have been mixed, but I have the space so I separated them into their own containers.
I have no idea why, but my pepper leaves always turn black under my grow lights. They flip to green once they're outdoors.
Oh. Ok those look way better. Just lighting I guess. I wouldn't worry about nutrients then.