Is it a necessity to have an isolation tank for hermit crabs?

I've been reading alot on how hermit crabs may need to be seperated during molting, agression, and getting used to other hermies. But is it a must have thing? If it is would I have to get it when I first get my hermies and the tank? Or can I wait till I need it?Is it a necessity to have an isolation tank for hermit crabs?
I have owned hermit crabs in the past and I work at a pet store and we do not separate our crabs when they are molting. I have honestly never heard of that before and I have had a long while worth of knowledge.





Is it a necessity to have an isolation tank for hermit crabs?
I don't isolate healthy moulters because my tank is 6 feet long so there is lots of space for moulting. If you have a 10 gallon it may be a good idea because there isn't as much space to moult. I do add in tank dividers for surface moulters.





It is a good things to have if you get new crabs. I isolate all new animals in order to make sure they are healthy enough to be added to the colony. So if you are planning on getting new animals in the future I highly recommend it.





Isolation tanks also come in handy if you ever run into mite issues down the road. or need a smaller enclosure for moving. We moved my crabs in their isolation tank because there was no way they could be moved in their big one.





I think isolating moulters is a personal choice and I prefer in tank isolation because of the stress moving a moulter can cause. But in cases with very bad moults or new crabs it's a good idea to have another enclosure.





I would recommend getting a cheap used 10 gallon and some plexi glass from the hardwear store. if you plan on crabbing for years to come you will need it eventually.
i have one just for emergencies. if you find a crab with an infection, or a surface molter, or one that has been attacked, or is streaking and needs to reshell, it makes sense to have a place to keep them separated from the rest of the colony for a bit. i just use the kritter keeper that i was wrongfully told would be a good home for them when i bought my first crab. it is large enough for the basics, but that is about it, and can be moved to a warm area in my house so that additional heating isn't required. you wouldn't want a crab with an exo infection to be in the main population and possibly spread the infection to others, or a fresh surface molter vulnerable to attack from other crabs.