Stush,
Lazy Lazy Lazy! That's me.
Miracle Gro Cactus, Palm and Citrus soil with added perlite - 1/4 to 1/3 by volume. Most of my cactus (except for the cold hardy ones) and all my succulents live in my greenhouse. The succulents get watered once a week and the cactus every couple weeks. The greenhouse gets to about 105F to 110F in the summer with 10% humidity (outside, the humidity is lower and so are the temperatures).
Daisy