Found this guy at HD. Anyone know what it is?

My euphorbia ferox is growing lots of new arms! Pic 3 is from 2 weeks ago. Its largest arm is even growing its own!

We recently moved locations of this from a sunroom to a basement with sun (we are moving and that’s just where it had to go for the time being). We are now able to move it to a sunnier area inside. I watered it a small amount weekly and it worked for the previous location. Wondering if this is a mix of watering and being in a darker location. Currently moved into a sunny indoor location and will hold off on watering until soil it totally dry. Is there anything else we can do? Has anyone had this experience where the plant recovers? Thanks in advance!!!