My goldfish has this thing about 1 and a half centimeters long hanging from it's...uh..bum. I suspect that it's poop. But what worries me is that the first centimeter is brown and then rest is kind off white and see through with kind of bubbly stuff on it. Also a little bit came off and all the fish are trying to eat it! If you know anything please reply. I love my goldfish and it is part of the family. AGAIN PLEASE HELP!!