Randall's Assessors are a peaceful species that make a perfect mate for your reef tank. Randall's Assessors prefer calm tank mates and plenty of rockwork. The Randall's Assessor is one of the rarest fish in the hobby. Randall's Assessors are originally from Japan, and almost never imported to the United States. The coloration of the Randall's Assessor changes dramatically depending on the viewing angle, and will become most colorful when they feel comfortable in their environment.