Looking for a fish that is both beautiful and big? Meet the violet banded killifish. This fish is a beautiful, shimmery blue color and is one of the largest Killifish on the market. They come in all different colors, but the blue variety is the most popular. They are a great fish to keep in a tank, as they can grow to be up to 12 inches long. They are a great addition to any fish hobbyist's collection.