^ literally have had that exact same thing happen to me in every single one of my reef tanks. In my non reef, they do the same thing but then take to this one shell I have. It's really wierd, all 4 clowns ive had in that tank (1 occelerus, 2 black and white percula, and 1 maroon) have all taken to this shell. It's a large nautilus shell I've had for at least 20 years and every single clownfish I have takes to it. I have no clue why it's a 75 gal tank with live rock and no more than 3-4 small, peaceful tankmates at all times. Sorry now I'm ranting about my own questions but if they are eating and all the water params are good then they should settle down within a week. Also it could be an overly agressive tankmate. Good luck with them!