Curious... I have had this happen to me several times, I Call it seeding the tank. Right after I set up my 240 I only had a couple of pieces of Xenia in tank. (I didn't want another tank over run with Xenia) But a couple of days after setting up the tank, the few colonies of Xenia that I had started droping its hands, and now I've got colonies popping up all over the place.

However the parent colony never looked wilted or stressed.