Yeah, they do reproduce on their own, and they can move like an anemone.....they will often leave behind a little piece when they move, and this forms a new one in the spot they were at. I just cut their heads off and cram them in a hole because glue never worked that great for me with shrooms. You don't want to go too crazy because then you'll be asking later "what will eat shrooms?"
I think shrooms, star polyps, etc make nice filler for in between things. You can seriously pretty much mangle a shroom, and it will be OK. Here is mine only 17 hours later, and he is already collecting his guts.
DON'T ANYONE DO THIS, and don't blame me if you do, but honestly, I could probably take my car keys from my pocket, rip this mess in half, and make sure it comes out as two.
Not something to do, but I just wanted to make a point of how tough these guys are, and that new folks don't have to worry about taking a knife to them. I never really came up with a fool proof way of attaching the heads...they reproduce so easily that I just stick them in holes and don't worry if they float off......there's more, but I guess a little net type deal would work, maybe tie one down with fishing line and remove it later when he attaches.......I went for the largest, because they will shrink up a LOT, and the smaller ones will shrink to so small that they are hard to work with. Anyway, here's the "stump" healing up after only 17 hours....