What Size Tank Does an Angelfish Need?
Adult standard length 6 inches, and the fish grows tall. Smallest tank considered: 39 × 16 × 20 inches, about 53 US gallons.
Full breakdown: how many fish per gallon.
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The figures
| Figure | Value | Source |
|---|---|---|
| Adult standard length | 6 in | Seriously Fish |
| Minimum aquarium base | 39 × 16 in | Seriously Fish |
| Smallest tank considered | 39 × 16 × 20 in | Seriously Fish |
| Approximate volume | 53 US gallons | Seriously Fish |
| Group / social | Best kept in small groups; may squabble with their own kind | Seriously Fish |
| Filter rating | 800-1000 liters per hour | Seriously Fish |
| Filter rating in gallons per hour | 211.36-264.20 gph | Calculated from the published liters per hour ÷ 3.785 (Seriously Fish; 1 US gallon = 3.785 liters) |
| Temperature | 75-86°F | Seriously Fish |
| Heater on the profile | 200-275 watts, assuming a room around 68°F | Seriously Fish |
| Aqueon bands that contain about 53 gallons | 150 watts for 30-55 gallons, and 200 watts for 50-75 gallons | Aqueon |
Full breakdown: what size filter for a 20 gallon tank.
How to size it
Height is part of the published minimum, not an optional extra. Seriously Fish gives the base as 39 × 16 inches and then names 39 × 16 × 20 inches as the smallest tank considered. Adult standard length is 6 inches, so the 20 inch height is the dimension that clears a tall body. About 53 US gallons is the volume tied to that tank.
Four times about 53 gallons is 212 gallons per hour, and five times is 265. The converted rating, 211.36-264.20 gph, tracks that four-to-five turnover. A single filter in that gallons-per-hour band is the match; the profile does not ask for two filters the way the oscar profile does.
The shopping link searches a 75 gallon aquarium because Aqueon draws the 200 watt band as 50-75 gallons, and 75 is the top of a band that already contains the about-53-gallon minimum. About 53 is also inside the 150 watt band, which runs 30-55 gallons, because 53 is not above 55. It is outside the 100 watt band (15-40) and outside the 300 watt band (65-90). The profile's own heater is 200-275 watts for 75-86°F, assuming a room around 68°F, so the watts on the species page start where the 200 watt Aqueon band starts and run past it.
Social size stays qualitative on purpose. The profile says small groups and warns that angelfish may squabble with their own kind. It does not print a headcount the way the neon tetra profile prints 8-10, so this page does not invent one.
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Accessory: a 200 watt heater, the bottom of the profile's 200-275 watt span and the Aqueon band (50-75 gallons) that contains about 53 gallons. Shop a 200 watt aquarium heater on Amazon
Related pages
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FAQ
What size tank does an angelfish need?
Seriously Fish lists a minimum base of 39 × 16 inches for Pterophyllum scalare, calls 39 × 16 × 20 inches the smallest tank considered, and gives the volume as about 53 US gallons. Adult standard length is 6 inches.
What filter does that angelfish tank need?
Seriously Fish lists 800-1000 liters per hour. Dividing by 3.785 gives 211.36-264.20 gallons per hour. Four times about 53 gallons is 212 gallons per hour, and five times is 265.
Which Aqueon heater bands include about 53 gallons?
Aqueon's 150 watt band is 30-55 gallons, and the 200 watt band is 50-75 gallons. About 53 gallons sits in both. Seriously Fish lists 75-86°F and a 200-275 watt heater, assuming a room around 68°F.
Should angelfish be kept singly?
Seriously Fish says they are best kept in small groups and that they may squabble with their own kind. The profile does not give a numeric group size.
Sources
- Seriously Fish, Pterophyllum scalare. https://www.seriouslyfish.com/species/pterophyllum-scalare/. Accessed Oct 2, 2026.
- Aqueon, Heater Wattage Guidelines. https://www.aqueon.com/-/media/project/oneweb/aqueon/files/us/educational/aq_heater_wattage_chart.pdf. Accessed Oct 2, 2026.