I was wrong. They are still red like earthworms, and there must be a hundred of them now. They are apparently more active in the dark. Any word on feeding safety? Lupin could be right about them not being Tubifex, that's just what the pet store calls them. For all I know they're blackworms or detritus worms or some other annelid. They are certainly the same species I introduced, though. About two inches, pretty active and red. They writhe in a bundle along with a clump of snails on the food I give them.