Board Thread:Dragon City Gameplay Questions & Answers/@comment-26162313-20150302171600/@comment-17736743-20150305025546

Each dragon will have one or more element. The can only go into a habitat that they have an element of. Any floating island can support any habitat, provided it has enough space.

There would be no problem, for example, putting a light habitat on a "dark" island, if that answers your question?