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Know your inhabitants. Start with their needs.

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Living coral: Sarcophyton glaucum
Sarcophyton glaucum — an example within this genus guide; traded forms may differ. Photo: Diego Delso · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.

Marine · corals

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All species

Living coral: Acropora
Acropora — an example within this genus guide; traded forms may differ. Photo: Albert Kok · Source · Public domainResized and compressed; no cropping or colour changes.
Marine · corals

Acropora reef corals

Acropora

Acropora includes many stony-coral species with branching, bushy and table-like forms.

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African water fern — Bolbitis heudelotii
Photo: w:User:Tsunamicarlos · Source · Public domainResized and compressed; no cropping or colour changes.
Freshwater · plants

African water fern

Bolbitis heudelotii

The Congo fern (Bolbitis heudelotii) gives an aquarium a completely different character than a bunch of stem plants.

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Amano shrimp — Caridina multidentata
Photo: MdE · Source · CC BY-SA 3.0 deResized and compressed; no cropping or colour changes.
Freshwater shrimp

Amano shrimp

Caridina multidentata

The Amano shrimp is a relatively large, active grazer, well known for feeding on growth in planted aquaria.

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Amazon sword — Aquarius grisebachii
Emersed form; leaves and flowers can differ from submerged growth. Photo: Krzysztof Ziarnek, Kenraiz · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.
Freshwater · plants

Amazon sword

Aquarius grisebachii

The Amazon sword plant is a striking rosette plant for aquariums where there is really room for a large leaf cluster.

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Banggai cardinalfish — Pterapogon kauderni
Photo: Pharaoh Hound · Source · CC BY 2.5Resized and compressed; no cropping or colour changes.
Marine fish

Banggai cardinalfish

Pterapogon kauderni

The Banggai cardinalfish appears calm, with striking black bars, pale spots and elongated fins.

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Bee shrimp — Caridina logemanni — Red-and-white cultivated Caridina logemanni.
Red-and-white cultivated Caridina logemanni. Photo: 5snake5 · Source · CC0Resized and compressed; no cropping or colour changes.
Freshwater shrimp

Bee shrimp

Caridina logemanni

Bee shrimp require a different approach from the more adaptable cherry shrimp.

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Bigspot otocinclus — Otocinclus macrospilus
Photo: Rainer Schmitt, 2004 · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Bigspot otocinclus

Otocinclus macrospilus

Otocinclus macrospilus is a small suckermouth catfish that grazes leaves, wood and aquarium glass.

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Black neon tetra — Hyphessobrycon herbertaxelrodi
Photo: Luki86 · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Black neon tetra

Hyphessobrycon herbertaxelrodi

The black neon tetra, Hyphessobrycon herbertaxelrodi, shows that a striking shoaling fish does not need a bright red belly.

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Blue-green chromis — Chromis viridis
Photo: Citron · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Marine fish

Blue-green chromis

Chromis viridis

Blue-green chromis bring movement to open water and can hover attractively above a reef in a suitable group.

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Boeseman's rainbowfish — Melanotaenia boesemani
Photo: H. Zell · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Boeseman's rainbowfish

Melanotaenia boesemani

Boeseman's rainbowfish, Melanotaenia boesemani, is striking as an adult male because of its transition from blue at the front to warm orange behind.

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Bronze cory — Osteogaster aenea
Photo: Pharaoh Hound · Source · CC BY 2.5Resized and compressed; no cropping or colour changes.
Freshwater · fish

Bronze cory

Osteogaster aenea

The bronze cory, Osteogaster aenea, is a familiar aquarium fish with a fascinating social side.

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Living coral: Caulastraea furcata
Photo: David Siu · Source · CC BY 2.0Resized and compressed; no cropping or colour changes.
Marine · corals

Candy cane coral

Caulastraea furcata

Caulastraea furcata, often called candy cane or trumpet coral, forms separate fleshy heads on a branching calcareous skeleton.

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Cardinal tetra — Paracheirodon axelrodi
Photo: Ltshears · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Cardinal tetra

Paracheirodon axelrodi

The cardinal tetra, Paracheirodon axelrodi, is a small shoaling fish with a brilliant blue stripe above an almost continuous red lower body.

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Carolina bacopa — Bacopa caroliniana
Emersed form; leaves and flowers can differ from submerged growth. Photo: User:BotBln · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · plants

Carolina bacopa

Bacopa caroliniana

Carolina bacopa (Bacopa caroliniana) has sturdy, opposite leaves that provide a calm contrast to delicate stemmed plants.

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Cherry barb — Rohanella titteya
Photo: Brian Gratwicke · Source · CC BY 2.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Cherry barb

Rohanella titteya

The cherry barb, Rohanella titteya, is a small Sri Lankan fish whose males can develop a deep red colour.

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Cherry shrimp — Neocaridina davidi — Red cultivated form of Neocaridina davidi.
Red cultivated form of Neocaridina davidi. Photo: DirkBlankenhaus · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater shrimp

Cherry shrimp

Neocaridina davidi

The cherry shrimp is a small freshwater grazer that is constantly exploring plants and other surfaces.

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Chili rasbora — Boraras brigittae
Photo: Daiju Azuma · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Chili rasbora

Boraras brigittae

The chili rasbora, Boraras brigittae, is an exceptionally small fish that brings considerable activity when kept in a quiet group.

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Cockatoo dwarf cichlid — Apistogramma cacatuoides
Photo: Apisto · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · fish

Cockatoo dwarf cichlid

Apistogramma cacatuoides

The cockatoo dwarf cichlid, Apistogramma cacatuoides, combines an impressive dorsal fin with fascinating territorial behaviour.

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Coral beauty angelfish — Centropyge bispinosa
Photo: Jenny (JennyHuang) from Taipei · Source · CC BY 2.0Resized and compressed; no cropping or colour changes.
Marine fish

Coral beauty angelfish

Centropyge bispinosa

The coral beauty is a compact dwarf angelfish with dark bluish margins and warm orange flanks.

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Creeping staurogyne — Staurogyne repens
Photo: 호로조 · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.
Freshwater · plants

Creeping staurogyne

Staurogyne repens

Creeping staurogyne (Staurogyne repens) forms low, sturdy shrubs that fit well between stones and along the front of a planted aquarium.

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Living coral: Discosoma nummiforme
Discosoma nummiforme — an example within this genus guide; traded forms may differ. Photo: Emőke Dénes · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.
Marine · corals

Discosoma mushroom corals

Discosoma

Discosoma are disc-shaped corallimorphs often sold as mushroom corals.

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