Emerald crab trap?
 

Our emerald crab seems to be living in the pump chamber of our biocube 14. Any ideas on trapping him? We can't seem to get ahold of him so maybe there is a way to fool him lol

can you fit a jar in there ? If you can wrap it with something so it can climb up and in (bate bottom) probable won't be able to climb out. You'll have to weight the bate. Good luck