what picture was it? if they aren't planaria then they are likely oligochaetes, and are harmless, so you wouldn't need to get rid of them. small fish eat them, I'm raising a platy fry in my cherry cube right now, and its diet consists of only those worms and maybe planaria for all i know.... i guess it wont accept prepared food with all that live food crawling about lol.
but srsly your worms are probably nothing to worry about.
your vid does indeed show a nematode like ashes said. though be aware that the FW oligochaetes behave similarly when disturbed. the difference is that the nematode will undulate its whole body to swim while the other worm will thrash about and wiggle only a part of its body, sort of like a spasm...and for a shorter period of time. the nematode will keep going.
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