I have a 40 gallon corner tank, and I keep trying to stock it nicely with tropical fish, and it just isnt working out! Right now I only have 2 cories and a guppy. Power goes out, temp drops, fish die. Get new fish, sick batch, dead in a day. Get fish from another store, they live fine for a few weeks, then I loose three when I forget to turn off the heater during a waterchange and it malfuntions. Well, I think I want to give goldfish a try. I think it would be alot lower stress because I wont feel like they will freeze if the power goes out. How many fancy goldfish for a 40 gallon corner tank? 2?