I guess you can, but it will may eventually fall off on its own. I accidently broke my red planet frag and left it hanging thinking it might reconnect on its own, it fell off in between rocks. I had a hard time getting the piece that broke and it fell to the sandbed. It was a pain in the ***. When I got it, I ended up gluing it back on where it broke, but I wish I just glued it somewhere else to test if it would grow better in a different spot in my tank. Good luck.