My little guy, Robby (smaller than a quarter), has burried himself. He keeps doing this then coming back up. Daily he does this. Lately I noticed that hes very antisocial and inactive. This time I see that he's REALLY burried himself. Think he's molting? Does anyone know how long approx it takes for a little guy like that to molt? My first crab, Hermie, molted above ground very quickly. Since Robby is burried I assume it may take longer...??? Thanks in advance.