Aha! They seem to be romantic wanderers of the seas... With their joined "tails", just like those cute seahorses, those modons in love cross the seas in search of cozy nest to house their love...
I didn't know that pool trick either! Do you think it could work in one of those inflatable children's pools? 'Cause that's the best I have at home :P
Tell us if it works when you try it (a video post would also be a nice idea) ;)