That's a great question!
Actually i would keep a heater in handy just in case if the temp goes down anyway.
also i would keep it for the winter, but just a small heater.
While hermit crabs do need heat, a heat rock is not a very good solution. Hermit Crabs can and will overheat themselves on a heat rock. A heat rock can get up to 100+ degrees, which is WAY to hot for a hermit crab. A better solution is to use an under tank heater pad, and mount it on the side of the tank. 2 small pads covering a corner is even better. You should make sure and have a cool side and warm side for your hermit crabs. Maintain about 80 degrees f on the warm side, and about 70 degrees f on the cool side and your hermit crab should be just fine. Keep the humidity at above 75% as well.
No, they're HERMIT crabs which means they could stay in a cave or some other outside-ish enviroment.
A lot
Hermit crabs like to be with others, like how other animals like to be. It always nice to have another partner. I had several hermit crabs and they lasted longer than ones with out any other hermit crab.
No, Hermit Crabs are omnivores.
No, Hermit Crabs and Fiddler crabs require two different environments. The Hermit Crab would drown in the water a Fiddler Crab needs. You can always ask your local pet store if there is any way possible though. Some hermit crabs live on land others live in water even land hermit need two enter salt water , fiddler crabs are brackish or fresh hermit crabs can't breathe in those environments
do hermit crabs perfer to have some light during the night or per darkness?
fish and bigger hermit crabs
Yes hermit crabs have antennas.
No hermit crabs are small and friendly
You should always have the temperature at 70-85 degrees Fahrenheit in captivity. And the humidity at 75-90 percent.
land hermit crabs like it reasonably hot at about 65 degrees Fahrenheit to about 95 degrees Fahrenheit They also like it humid.