Autoflower not healthy

Ok an update i dont know if this is the main reason but i thought let me buy another bluelab ph probe the one i was using was reading 7.8 and the new one is reading 6.0 so theres a 1.8ph error thanks to the old ph probe would low ph do this to the plants so ideally i was thinking my water waa at 6.0 where as it was actually 4.2

This is indeed mg def but it is caused by way too much nitrogen , that is locking out your magnesium , soon your leaves will all go yellow or brown , if you have it this soon in your grow better too restart , she will take forever too finish too much problems to solve my friend

Thank you bulbi im using the lightmix schedule on biobizz but a half of whatever is on there how much cal mag do i add

hey there Shadowseeds, that's magnesium deficiency , just add cal mag and the problem should stop spreading quickly and hopefully the plant will recover before flowering. Hope this helps ! 🚀