Propagation: Must pereskiopsis spathulata cuttings be planted in cactus mix?

Must pereskiopsis spathulata cuttings be planted in cactus mix?
I just got rather a lot of them, and don't have enough cactus mix for all of them.

 

You can plant them in sterile sand, as well.

 

Really? And then water them with fertilizer, I guess, eh? I didn't know that.

 

A buddy of mine just uses regular potting soil. His are doing great.

 

I had to clear out all my pereskiopsis spathulata due to an intractable mealybug infestation.
Sorry - don't have any for trade or sale.