Were Changeling & Aqualad ever on the team at the same time?

And, if not, what's the significance?

why yeah! I just saw them together today on the TV cartoon show...oops you mean the comic books? I think they did - somewhere in the Tales of the Teen Titans #47 and #48 which spotlights Aqualad and Aquagirl...and also in #50 at the Donna Troy's wedding.

funny thing....I did not realize what mentioned above have in common is that they are fighting HIVE.