I do, LOL. Here is a good size conch shell taken over. I have considered busting the shell into other pieces and putting a little in each tank into a position that is easy to get them out of so I can give them to the locals when they over grow their area. I thought I could place large rubble rock around them for ease of removal as they spread.
I would do that, as they are a total PITA to remove/frag/give away. And they overtake everything else.