Diadema acara
Aequidens diadema
- Adult size
- 12 cm5 in
- Start with
- 1
- Tank length
- 100 cmabout 3 ft (39 in)
- Lifespan
- 8–10 yrs
- Temperature
- 22–28 °C72–82 °F
- pH
- 6.4–7.5
- Hardness
- 1–20 dGH
- Diet
- omnivore
A blackwater acara that does best in soft, acidic water with wood and leaf litter; pairs defend a modest territory.A blackwater acara that does best in soft, acidic water with wood and leaf litter; pairs defend a modest territory.
Tank sizes
Good tankmates
Avoid with
- Acei cichlid
No shared pH rangeNo shared pH range
- Brevis shell dweller
No shared pH rangeNo shared pH range
- Caudopunctatus
No shared pH rangeNo shared pH range
- Multies
No shared pH rangeNo shared pH range
- Pindani
No shared pH rangeNo shared pH range
- Rusty cichlid
No shared pH rangeNo shared pH range
- Saulosi cichlid
No shared pH rangeNo shared pH range
- Similis shell dweller
No shared pH rangeNo shared pH range
- Afra cichlid
No shared pH rangeNo shared pH range
- Alligator gar
Alligator gar may eat Diadema acaraAlligator gar may eat Diadema acara
- Antenna ray
Antenna ray may eat Diadema acaraAntenna ray may eat Diadema acara
- Arapaima
Arapaima may eat Diadema acaraArapaima may eat Diadema acara
Sources
| temperature | 22–28 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04; agrees with FishBase (fishbase.se), retrieved 2026-10-04 · medium |
|---|---|---|
| ph | 6.4–7.5 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · medium |
| gh | 1–20 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · medium |
| origin | Rio Negro and upper Orinoco basins | curated-v0 (needs expert review) · low |
| notes | A blackwater acara that does best in soft, acidic water with wood and leaf litte | curated-v0 (needs expert review) · medium |
| beginner friendly | false | curated-v0 (needs expert review) · medium |
| care level | moderate | curated-v0 (needs expert review) · medium |
| color palette | #8A7A4A, #2E2E2E, #4B8AA0 | curated-v0 (needs expert review) · low |
| activity | moderate | curated-v0 (needs expert review) · medium |
| swim zone | middle | curated-v0 (needs expert review) · medium |
| temperament | semi-aggressive | curated-v0 (needs expert review) · medium |
| fin nipper | false | curated-v0 (needs expert review) · medium |
| long finned | false | curated-v0 (needs expert review) · medium |
| territorial | true | curated-v0 (needs expert review) · medium |
| schooling | false | curated-v0 (needs expert review) · medium |
| schooling min | 1 | curated-v0 (needs expert review) · medium |
| diet | omnivore | curated-v0 (needs expert review) · medium |
| lifespan years | 8–10 | curated-v0 (needs expert review) · low |
| growth to adult months | 15 | curated-v0 (needs expert review) · low |
| length weight | {"a":0.025,"b":3} | curated-v0 (needs expert review) · low |
| planted safe | true | curated-v0 (needs expert review) · medium |
| min tank length | 100 | curated-v0 (needs expert review) · medium |
| body shape | cichlid | curated-v0 (needs expert review) · medium |