The simple answer is - you can't!
These are two completely different species - needing totally different living conditions !
it depends how big the hermit crab is or the fish bowl
if your hermit crab pinches you put it under cold water
It depends on the hermit crab but I would personally say just to be careful No the big one might hurt or bully the smaller crab.
no you but you can feed him or her crikets of worms such as blood worms and meal worms
yes
down the toiliot
A hermit crab would never be seen in the wild environment that a leopard gecko comes from. A crab cannot sustain heat reaching 100F in the mid afternoons. They cannot be housed together.
You should let it mold. It is part of life for a Hermit crab.
a hermit crab
What is a Hermit Crab's predator?
Yes, hermit crabs don't usually fight. You could give the new hermit crab a bath so that it smells the same as the other hermit crab in you tank.
If you mean will it kill the crab, no. However the hermit crab probably won't be able to use most toys. Depending on what it is.