Hi ghostcarp
If you add salt to the water for your mollies and swordtails, you should not have corys at all. But if not, some corys would be a great addition to your tank.
I would not recommend C. habrosus though. They are quite tiny and, like all corys, must be kept in a school.
A more suitable choice considering your other fish, might be C. aeneus (bronze or albino), C. paleatus (peppered cory), C. julii or C. trilineatus. These would be happy if you had a small school of only 3 and would be sturdy enough to get along with your larger fish.
