Yeah, he's still in veg, these are mums. No need for any toxic stuff, I keep telling you safer's or water/iso will do fine.
The most important thing you need to be aware of, is the infestation will continue until the breeding cycle is broken. Mites are easy, spray every 2 days for 14 days. Done. I've been infested with mites multiple times since moving to Colorado. Everyone swears they're 'resistant' mites, their breeding cycle being broken says differently.
Also, no 'resistance' build up using insecticidal soaps or water/iso. They die the same way every time.