I came into a project that was already "done" and I was asked to make some changes. One such change is the permalink structure for a custom taxonomy. For some reason they made "Communities" a custom category instead of a custom post-type, even though it has its own data associated with it -- and the issue is that they want to see the slug in the link when viewing that category's page.

In other words, they have this:
mysite.com/communities/?community=43

but they want this:
mysite.com/communities/community-slug

Any advice or help would be greatly appreciated. Thanks in advance.