they do adjust fast. One night and they both had tunnels. I too bought from presurcukr very awesome guyNice lil suckers, aren't they? I recently picked up 3 of these guys from AB member Presurcukr. They adapted very quickly to their new vials and within 24 hours had dug little tunnels and set up shop. Right now they look like fat ticks as even the smallest B. dubia is a hefty meal for something that small.