I just got an Iridescent Shark 2 weeks ago. He was doing good at first. He started acting funny the next day, he was laying around in the tank. He would eat when I put food in. He seemed to get better after a few days and swam around a lot more. He had no ich, fungus, popeye, nothing. He looked great. He didnt look bloaded. I found him dead a few min. ago, laying on the bottom. Please if anyone can help me figure out why he died, that would be great. I had the water tested at a local fish store last week and they said my water readings was at normal range. He was in the tank with a elephant nose fish, and a fancy gold fish. Thank you!