I also think sebae, does it have coloured tips? These are a difficult nem to keep and most likely will not host your clowns (if they are ocellaris or percula clowns) do you have the right conditions to care for it? If you are looking for a symbiotic relationship you would have better luck with a bubble tip but there are still no guarantees! I have two nems and my clowns host a hammer coral. Go figure!