I know the African Milk Tree isn’t technically a cactus, but i’m hoping to still get some help here. I got this on sale and Greg (the website) told me low humidity and low water need. So I thought “great! maybe I can keep a cactus alive” Now I’m overthinking. When I got him his soil was bone dry, I kept him in relatively the same soil after I checked on the roots and repotted. I think it’s some kind of seed starter mix but I’m not totally sure. He is under a grow light with moderate intensity for 12 hours a day now. Basically what I’m asking is should I water him?? And any other tips are appreciated! I’m so paranoid when it comes to cacti and succulents because I always think they need water when I know they hold it within themselves.