The problem is, my larger crab Blue, has now disappeared and this smaller crab is sporting his shell. It is HUGE on him too. I really am wondering if he kicked blue out of it so he could try that one on too and decided to keep it? But where did Blue go? He is a big dude and hard to miss so he has to be buried? Other case scenario, Blue went down to molt and Mr. Crabs followed him waited for him to be vulnerable and stole his shell?
Also, I am 99% sure Blue is not in another shell, as the larger ones in that tank are all still there. So I feel like he is naked somewhere..
Has anyone ever had this happen and what do I do! Its driving me crazy. I really just want to know that Blue is OK. Any input or advice would be greatly appreciated!
Here is Mr. Crabs the culprit

This is Blue- almost double the size of Mr. Crabs- so how could he get him out of that shell?!
