Thanks! I'll do that today. The person working at the garden center said they would be fine to plant together. I would never have thought that catus soil mix would have needed more mixing.

Quite often, C&S mixes contain lots of peat. That makes them more water retaining. If you still have bag, check for ingredients. They also add sand, and usually not gritty enough. Doesn't help drainage either.

Do you know what the 2nd plant is?

Could the little round puffer-fish looking plant be euphorbia 'suzannae'

I just got done adding the perlite mix to the plants. Should I cut back the dried leaves? I don't know the name of the second little plant. I looked for it in my book of succulents and found something similar, but not the exact one.

...and have all your pots got at least one drainage hole in them? No amount of fast draining mix will help any plant that's in pot without a hole :-)

Gill