I agree, it does resemble the looks of chaeto, although I'd say it's some type of tube worm. I had colonial-hydroids which look harmless, but give off a nasty sting that lasts several days. Granted, colonial-hydroids look different (shorter and beige), but to error an the safe side you may want to get rid of them before your snail distributed them around the tank, making future removal much more difficult. Best of luck!