Hello, I have one specific snail which always seeks out another specific snail and continually piggybacks on this other snail’s shell. The other snail seems to slide around hoping to get him off his back but the hijacker hangs on happily looking around! If I separate them, he looks for him and jumps back aboard! Why does he do this and should I keep separating them? Sometimes he is completely hanging off of him upside down and it looks very heavy and uncomfortable. They do not appear to be mating. They don’t interact face to face. Thanks for any comments!!