In response to all..
Lots of indirect light
I have never fertilized it ... didn't know cactus needed it
I talk to it and my Aloes on a regular basis.
I haven't pinched it back...but the "leaves" are shriveled some...like not enough water but I know it's gotten enough..
Not in a drafty place. but I don't put it in a dark place 24/7 either....