Yeah you can just pop him off and dab the base with a paper towel and just reglue it back to the plug. I like to go by the dollar store occasionally and buy them out of their green tubes of gel based super glue, cheap and works great. Here’s a little tip and people may think I’m crazy because I thought the guy who told me this was crazy! But, if you glue the duncan horizontally to your rock, like glue the base or plug at a 90 degree angle to the bottom of the tank, the growth of the duncan will be insane! Dunno why this is but it works.