Last updated: Mar 16, 2026 ยท Last checked: Mar 24, 2026
Best Fish for 55 Gallon Tanks
A 55 gallon tank works well for taller centerpiece fish and medium-sized communities, though the footprint is not as forgiving as a 75 gallon.
Top picks
1. Boesemani Rainbowfish (Melanotaenia boesemani)
Best for: colorful active schooling display
Why it makes the list: one of the best medium rainbowfish for a bright, high-movement community.
- Adult size: around 4 inches
- Behavior: active schooling fish
- Water: 74 to 80 F, pH 7.0 to 8.0
- Diet: varied omnivore diet with color-support foods
- Setup: high oxygen, strong flow, long swim space
- Watch-outs: cramped groups drive chasing and stress
- Buying note: compare pricing by group, not by singles
2. Angelfish (Pterophyllum scalare)
Best for: classic tall centerpiece tank
Why it makes the list: iconic look, strong presence, and a natural fit for taller aquariums.
- Adult size: body around 6 inches with tall finnage
- Behavior: forms hierarchy and pairs
- Water: 76 to 82 F, pH 6.0 to 7.5
- Diet: quality cichlid pellets and frozen foods
- Setup: vertical wood or plants with calm companions
- Watch-outs: fin nipping and crowding the same water column
- Buying note: verify body size and fin condition
3. Electric Blue Acara (Andinoacara pulcher)
Best for: personable centerpiece cichlid
Why it makes the list: great color, strong personality, and easier community behavior than many cichlids its size.
- Adult size: 6 to 8 inches
- Behavior: moderate temperament with enough space
- Water: 74 to 80 F, pH 6.5 to 7.8
- Diet: omnivore cichlid diet
- Setup: caves, sturdy hardscape, line-of-sight breaks
- Watch-outs: pair aggression in under-structured tanks
- Buying note: confirm source line and size expectations
4. Pearl Gourami (Trichopodus leerii)
Best for: peaceful larger centerpiece fish
Why it makes the list: elegant, calmer, and a strong alternative to more aggressive centerpiece species.
- Adult size: 4 to 5 inches
- Behavior: generally peaceful
- Water: 75 to 82 F, pH 6.0 to 7.5
- Diet: accepts quality dry and frozen foods
- Setup: plant cover and calmer flow zones
- Watch-outs: aggressive tankmates reduce confidence and feeding
- Buying note: ask about sex and maturity for pairs or groups