What do you have in the tank that you would want to remove it?
You just pick him up and remove him. They are not that hard to remove. Is he huge or something?
Do the removal in one swoop, he'll try to hunker down if your just touching on him first. If he's on an uneven surface, like a rock, he'll be easier to remove. But they really aren't that hard. It's things like big ole chitons and abalones that are difficult to remove when they "hunker".
If you lived closely he would have a room in my tanks.