3 days ago, i bought a small fancy goldfish at walmart.i named him Bubbles.he is very cute . today, i bought another small fancy goldfish who is also very cute. I named him Nacho.Nacho was doing really well.he was swimming around the tank with bubbles, and eating good, but a few hours later after bringing him home, i check on him and he is dead. im just wondering if Bubbles attacked Nacho. if wouldbe great if someone could help me.