It’s seeds from my Apple Betty I grew outdoor last season got 10-15 seeds so I dropped 5. She’s a cross between Chen dogs sis x chocolate diesel x and sour apple og. Sweet I’ll let her go it more then likely came from my shirt ass humidifier spitting water I have a new one one the way.That honestly looks like maybe a couple drops of nutrient solution or water got hung up on the leaf and burned some in the lights, looks more mechanical than deficiency.
If it does progress then look towards a Mag and correct with Epsom.
That plant looks really nice and healthy, great leaves! What strain is that?
BetI wouldn’t sweat that unless it spreads and shows on other leaves. I reuse soil regularly.
I got a journalSounds like a really interesting cross and the plants look great. Keep it up and let us know how she turns out.