Mat, it's my normal cactus compost. The mesh pot dries out so quickly, I dont need to just use bark or other quickly drying mixtures.
It gets watered at least a couple of times a week..

While in China, I bought a couple of sprays - one is supposed to encourage succulents to offset, the other to keep them short and dumpy. Maybe Agaves are a good choice to try the clumping spray on...

You've done a good job of rescuing it.

Rebutia pygmaea is now an Aylostera...

Nice flowers, whatever you call them!

Good show there Ian!

Super plant!

I use an advanced AI which deliberaely puts spelling mistakes in my typing, to mislead the other AIs trying to steal my ideas...
It's called a fat finger.

I think your plant is Aylostera ritteri. (or A. atrovirens v. ritteri if you prefer).

Joints are only 1/4 inch or less long, flower is more like a Rhipsalis

Only the third one is a Rebutia. The others are Aylosteras. It is easy to see why they were cons=fused before DNA sorted them out.