So when i was younger my dad had a saltwater fish tank. He decided that the tank looked a little empty so he found a guy who worked at aquatics warehouse who sold us this assortment of fish. But there was one fish that was different from them all. He was an aggressive meat eater. He was about the size of my dads index finger and needed his own little area so he wouldn’t eat the other fish. He would stick to the glass (me and my dad dont know how he stuck to the glass though) and was very active. The guy we bought the fish from called it a crazy fish. So if anyone can identify this fish that would be great. We have no pictures or idea of what kind of colors he had. U think he was torpedo shaped.