No luck catching giant gorilla

[OceanJack]

Been since August, it's only 15 pounds of live rock. I realistically do not see molts too often and the size of the crabs lead me to think they probably weren't larvae stage

 

[ygbsmww]

New update, this marks #4. One came in on the rock originally, but this is the 3rd one that I caught from the tank.

How are you catching these guys?