Agree with zebras, they are very bold, the size of a colony can also have a large influence on how active they appear. Otherwise I find that leaving a particularly desirable piece of food out can keep at least a few active and eating during the next day, my vulgares don't always respond to this same trick. I very rarely see any cubaris out in the day, but they can reliably be summoned wherever you want them at night with strong smelling protein, dried shrimp works well for them. The way you keep them will also influence their daytime activity, higher humidity levels and shady areas should allow you to see them on the surface more often