These angelfish need very good water quality. Anything below acceptable will result in stress, which lowers their immune system and can lead to several illnesses. Water changes of 10-15% should be performed every 2 weeks for best results in 180 gallon tanks. In tanks over 250 gallons (940 l), water changes of about 30% every 3 – 4 weeks should work fine to keep water quality high. At times with tanks that are very mature you may get away with more time in between water changes, but only if it shows no ammonia or nitrite and has very low nitrates (less than <10).
As with all angelfish, the pH level should never drop below 8.0. Controlling pH levels is best resolved by water changes rather than chemicals. Using testing equipment is suggested to tell you when to do a water change.
- Water Changes: Bi-weekly – Suggested water changes of 10-15 % bi-weekly for a 180 gallon tank, with less needed for larger 250+ gallon tanks and very mature aquariums.
An adult Queen Angelfish will need a tank that is 180 gallons (681 l) or larger. They are bullies, beautiful bullies, but bullies non-the-less, and in anything smaller they will abuse their tank mates. Juveniles may be grown out in smaller tanks, but after only a few months their growth will render smaller tank useless. Starting with a larger tank is a good idea rather than having to relocate them. Two Blue Angelfish can be added to a tank as long as there are plenty of hiding places. They must be of different sizes and added at the same time. They can be kept with other angelfish in tanks well over 220 gallons (832 l). Water quality must be kept high and and a pH of at least 8.0 is necessary.
The tank should have plenty of live rock arranged to form multiple hiding places for retreat if they feel threatened. Stress will make an angelfish ill very quickly. This big fish also needs plenty of room to turn around and maneuver, so plan the rock placement accordingly. The live rock should have plenty of naturally growing algae on it before adding the juvenile. In nature these are shallow dwelling fish that utilize the sunlight to absorb certain vitamins and thus avoid developing deficiencies, so a good spectrum light in the aquarium will also help this angelfish stay healthy.
- Minimum Tank Size: 180 gal (681 L) – Juveniles can be kept in 135 gallons (511 liters) to start, but need to move into a larger tank before they are full grown. Larger tanks, 250 – 300 gallons (946 – 1,135 liters) or more are ideal for these angels best development.
- Suitable for Nano Tank: No
- Live Rock Requirement: Typical Plus Hiding Places
- Substrate Type: Any
- Lighting Needs: Moderate – normal lighting – Angelfish need at least a daylight bulb to help them absorb vitamins A and C from their diet.
- Temperature: 70.0 to 82.0° F (21.1 to 27.8° C)
- Specific gravity: 1.023-1.025 SG – Although a specific gravity of 1.015 can be employed temporarily when treating disease, for long term health keeping the tank at 1.023 is best.
- Range ph: 8.0-8.4
- Brackish: No
- Water Movement: Any
- Water Region: All – They will swim in all areas of the aquarium. In the wild they are a benthic species hanging around the bottom in areas of sponge, coral, and rock.