So sorry you lost your fish, Cat. A raccoon took care of all but one little gold fish for us during the summer, including 2 very large 10 year old Koi and several Butterfly Koi.
So there were no fish to worry about during the colder than cold winter. I won't be daunted,. I will have more fish, but hopefully I won't be so attached to them. But only gold fish, and no $$$ Koi.