Shoal & Stem

Species Catalogue

1,376 species — care guides, community photos, water parameters, and tank-mate compatibility.

fish
beginner

Neon Goby

Elacatinus oceanops

fishsaltwater
2″·20+ gal·group 2+·peaceful
fish
intermediate

Neon Green Rasbora

Microdevario kubotai

fishfreshwater
1.5″·10+ gal·group 6+·peaceful
fish
beginner

Neon Rainbowfish

Melanotaenia praecox

fishfreshwater
3″·20+ gal·group 6+·peaceful
fish
intermediate

Neon Rasbora

Sundadanio axelrodi

fishfreshwater
1.5″·10+ gal·group 6+·peaceful
invertebrate
Mmedium

Neon Red Crayfish

Cambarellus patzcuarensis var. Orange

invertebratefreshwater
1.5″·10+ gal·semi-aggr.
Neon Tetrabeginner

Neon Tetra

Paracheirodon innesi

fishfreshwater
1.5″·10+ gal·group 6+·peaceful
snail
beginner

Nerite Snail

Neritina natalensis

snailfreshwater
1″·5+ gal·peaceful
plant
intermediate

Nesaea Crassicaulis

Nesaea crassicaulis

plantfreshwater

A striking stem plant with relatively large, broadly oval leaves that take on vivid orange-red tones under high light. The thick stems give it its species name (crassicaulis = thick-stemmed). It requires good light, CO2, and regular fertilisation but rewards with some of the most vivid colouration of any aquatic stem plant.

plant
advanced

Nesaea Golden

Nesaea pedicellata 'Golden'

plantfreshwater

Vibrant golden-orange stem plant that stands out from typical reds and greens. Demanding but creates unique colour contrast in high-tech scapes.

fish
beginner

Niger Triggerfish

Odonus niger

fishsaltwater
18″·100+ gal·semi-aggr.
fish
intermediate

Nijssen's Corydoras

Corydoras nijsseni

fishfreshwater
2″·15+ gal·group 6+·peaceful
shrimp
Mmedium

No Entry Shrimp

Caridina logemanni

shrimpfreshwater
1.5″·5+ gal·group 10+·peaceful
fish
beginner

Norman's Lampeye

Poropanchax normani

fishfreshwater
1.5″·10+ gal·group 6+·peaceful
fish
beginner

Norman's Lampeye Killifish

Poropanchax normani

fishfreshwater
1.5″·10+ gal·group 6+·peaceful
fish
intermediate

Nothobranchius Killifish

Nothobranchius rachovii

fishfreshwater
2″·10+ gal·semi-aggr.
plant
Mmedium

Nymphaea Stellata

Nymphaea stellata

plantfreshwater

Nymphaea Stellata is a stunning red water lily with star-shaped leaves that deepen in color under high light conditions. This rooted stem plant produces both submerged and floating leaves, creating a striking visual focal point in the aquarium. It is moderately demanding but rewarding for aquarists willing to provide adequate lighting and nutrients.

plant
beginner

Nymphoides Taiwan

Nymphoides sp. 'Taiwan'

plantfreshwater

Taiwan Nymphoides produces attractive round-to-heart-shaped leaves with reddish-brown mottling on the underside. It spreads by runners and can be kept compact with regular trimming. Unlike surface-growing Nymphoides, it stays submerged in good lighting. A distinctive mid-ground to background plant with a bold, pond-like aesthetic.

fish
beginner

Ocellaris Clownfish

Amphiprion ocellaris

fishsaltwater
3.5″·20+ gal·group 2+·semi-aggr.
fish
intermediate

Ocellifer Synodontis

Synodontis ocellifer

fishfreshwater
8″·40+ gal·peaceful
plant
beginner

Octopus Plant

Pogostemon octopus

plantfreshwater

Unique plant with long, thin tentacle-like leaves arranged in whorls. Fast-growing, forgiving, and adaptable. Excellent hiding place for fry and shrimp.

fish
beginner

Odessa Barb

Pethia padamya

fishfreshwater
3″·20+ gal·group 6+·semi-aggr.
plant
beginner

Odora Hygrophila

Hygrophila odora

plantfreshwater

A lesser-known species with elegant, slightly wavy narrow leaves. Grows quickly in good conditions and provides dense cover for fish and invertebrates. The emersed form produces small fragrant flowers, giving the species its name.

snail
beginner

Olive Nerite Snail

Neritina reclivata

snailfreshwater
1″·5+ gal·peaceful
fish
Mmedium

One-Lined Pencilfish

Nannostomus unifasciatus

fishfreshwater
1.4″·10+ gal·group 6+·peaceful
fish
intermediate

Opaline Gourami

Trichopodus trichopterus

fishfreshwater
5″·20+ gal·semi-aggr.
coral
beginner

Open Brain Coral

Trachyphyllia geoffroyi

coralsaltwater
2″·30+ gal·peaceful
fish
intermediate

Oranda Goldfish

Carassius auratus

fishfreshwater
8″·20+ gal·peaceful
shrimp
Mmedium

Orange Eye Blue Tiger Shrimp

Caridina mariae var. OEBT

shrimpfreshwater
1.2″·10+ gal·group 6+·peaceful
fish
intermediate

Orange Flash Cockatoo Dwarf Cichlid

Apistogramma cacatuoides

fishfreshwater
3″·20+ gal·group 2+·semi-aggr.
fish
beginner

Orange Molly

Poecilia sphenops

fishfreshwater
3″·20+ gal·group 3+·peaceful
shrimp
beginner

Orange Neocaridina

Neocaridina davidi

shrimpfreshwater
1.2″·5+ gal·group 6+·peaceful
snail
Mmedium

Orange Poso Rabbit Snail

Tylomelania gemmifera

snailfreshwater
1.2″·10+ gal·peaceful
shrimp
Eeasy

Orange Pumpkin Shrimp

Neocaridina davidi

shrimpfreshwater
1.5″·5+ gal·group 6+·peaceful
shrimp
beginner

Orange Rili Shrimp

Neocaridina davidi 'Orange Rili'

shrimpfreshwater
1.2″·5+ gal·group 6+·peaceful
shrimp
beginner

Orange Sakura Shrimp

Neocaridina davidi

shrimpfreshwater
1.2″·5+ gal·group 6+·peaceful
fish
beginner

Orange Swordtail

Xiphophorus hellerii

fishfreshwater
4.5″·20+ gal·group 3+·peaceful