I turned my filter off to do my water change. When I went to turn it back on when I was done tons of tiny wriggling brown worms shot out of my filter all over the tank. I was horrified. Obviously my fish started eating them which caused me to walk away from disgust. I just wanna know if these are harmful or not. I started treating my fish for flukes today. Those couldn't be worms related to flukes could they? I wont be able to get any pictures because they are too small.