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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.
yes
down the toiliot
You should let it mold. It is part of life for a Hermit crab.
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.
Yes, but if your hermit crab starts eating them, take the plants out.
To put it bluntly they are it's balls or testicles.
Put the water in a hermit crab pool from a pet store, but make sure if you use tap water to get a Purifier Liquid to kill those nasty chemicals.
yes although it would be wise to clean and disinfect it first, you don't know why your old crab might have died.