I just added new sand to my new 55 gallon aquarium and in the sand are some hair like worms that bury their selves. They are really small and i just want to know what they are and if the are harmfull.
Those are spaghetti worms. There's no need to try and get them out -- they won't hurt anything. Plus you wouldn't be able to get them out if you tried -- your sand is full of them.