All hermit crabs present and accounted for

I feel like I should mention (finally) that all three hermit crabs are present and accounted for, in the crabitat (hermit crab habitat = crabitat). You may recall that at times, Hermione tends to go missing.... well, she's in a while, shiny shell (a new one, for her) and she's back. All three crabs seems happy and healthy - they are active and eating plenty. :) Now, I just have to see what's up with the millipede. Why hasn't she been active lately?