What Types of Fish Have You Owned?

I used to keep an arowana. It was when I lived in the tropics where the weather was suitable for this kind of fish without a heated tank. It was very aggressive and was also an incredibly voracious feeder. It ate geckos (they were everywhere and we caught them to feed him), cockroaches, baby frogs (yes, you could buy them from pet shops), fresh water shrimps and their favorite, a type big centipede that you could buy frozen. It died mysteriously one day and we suspect that our cousin might have accidentally fed it with cockroaches that had been killed with insecticides.