My dad just bought a 10 gallon tank, and he bought just one fish. I think it is called the arrowanna, but I know it is good luck. He thinks that it will only be good luck if its the only fish in the tank. I have bought some neon tetras to add to the tank and when I went to sleep, my dad disposed of my fish. The other time I bought some guppies, and he did the same thing. I don't know what to do, I can't afford my own tank... why is my dad so mean?