It is believed that the Queen Angelfish is one of the most striking angelfish. Bright yellow and electric sapphire-blue highlights make an Angelfish its almost-iridescent look. The fish has an elongated dark spot on its forehead that is surrounded by brilliant blue. The pelvic and dorsal fins are long. With the potential to reach 18 inches in length, this Queen Angelfish needs a large tank - at least of 250 gallons. It should also have many hiding spots as well as live rock for grazing. It is not a reef-safe fish The Queen Angelfish is prone to bite at soft and stony corals (sessile invertebrates) and mantles from clams. It is a bit destructive, and should be added to the tank of the community at the end of the set up. It is difficult to keep the Queen Angelfish typically suffer from poor nutrition and water parameters.   Queen angels diet should contain Spirulina as well as marine algae premium angelfish products mysis, frozen shrimp or mysis as well as other meaty foods. In addition, the Queen Angelfish should be fed at least three times per day.   The small juvenile is likely to have juvenile colors or could change color to adult coloring in the teen years while the medium will be a sub-adult and the large in adult coloration.   Approximate Purchase Size: Juvenile Small: 1" to 1-1/2"; Medium: 1-1/2" to 2-1/4"; Large: 2-1/4" to 3-1/4"; Adult Small: 3" to 3-1/2"; Small/Medium: 3-1/2" to 4"; Medium: 4" to 4-1/2"; Medium/Large: 4-1/2" to 5"; Large: 5" to 6"; Extra Large: 6" to 7"