I would say 3-4. I don't target feed mine they will run after food sometimes. I just try and get a few pellets close to them when I feed. They are so cool when they get to walking and carrying on. They will jump from my frag rack to the Kenya tree. The ones in the dt just hang out in the monti cap. Havent watched with lights out to see if they move around though. I lost one to my overflow and haven't seen but the 2 in the display in a while but they are so small would be hard to find them in a 90. I got a killer price at $5 each so I got several just in case something ate them.