I live in washington and a couple weeks ago, my brother and i caught some crawdads and decided to feed them to our fish. i kept a small one in my moms crab tank, and put about four tiny one's in my 40 gallon tank for food. now both tanks have tiny BUGS AND WORMS! i can't find any pictures of them anywhere, but they are almost microscopic. how do i get rid of them?! i'v tried salt and heat, but they won't completly go away. please anything helps.