I have often seen what look like tiny little bits of fluff on legs running around very rapidly on the plants but today I found a really big one. Excuse the pictures, I know I need a macro lens
That's actually the back, here you can see the head
Another front view, showing the long, curved jaws
So what on earth is that creature? Google to the rescue: It's a Lacewing larvae: predatory insects that eat other insects such as aphids. Since they are on the succulents, all I can say is Go! Go! Go!
As a fun touch, they sling the carcasses of their past victims and other bits of debris on to their backs and use it as camouflage.
Such ghoulish little insects, this is what the adults look like:
Image: Wikipedia, author - Alvesgaspar - Own work, CC BY-SA 4.0,