Shoal & Stem

Species Catalogue

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

snail
beginner

Red Ramshorn Snail

Planorbarius corneus

snailfreshwater
0.75″·5+ gal·peaceful
shrimp
Eeasy

Red Rili Shrimp

Neocaridina davidi

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

Red Root Floater

Phyllanthus fluitans

plantfreshwater

Popular floating plant with round leaves that turn red under high light. Long, red roots dangle attractively. Excellent nutrient absorber.

shrimp
Mmedium

Red Ruby Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·5+ gal·group 10+·peaceful
fish
beginner

Red Swordtail

Xiphophorus hellerii

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

Red Tail Catfish

Phractocephalus hemioliopterus

fishfreshwater
48″·1000+ gal·aggressive
shrimp
Mmedium

Red Tibee Shrimp

Caridina sp. (Tibee)

shrimpfreshwater
1.25″·5+ gal·group 10+·peaceful
plant
intermediate

Red Tiger Lotus

Nymphaea zenkeri

plantfreshwater

The red tiger lotus produces large, dramatic maroon-red leaves with speckled patterns. Without high light and CO2 it will send leaves to the surface; regular trimming of surface leaves encourages bushy underwater growth. An impressive centrepiece plant for larger tanks.

fish
advanced

Red Turquoise Discus

Symphysodon sp.

fishfreshwater
6″·55+ gal·group 4+·peaceful
fish
beginner

Red Wag Platy

Xiphophorus maculatus

fishfreshwater
2.5″·10+ gal·group 3+·peaceful
shrimp
Mmedium

Red Wine Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·5+ gal·group 10+·peaceful
fish
intermediate

Red-Bellied Piranha

Pygocentrus nattereri

fishfreshwater
13″·100+ gal·group 5+·aggressive
fish
Mmedium

Red-Striped Killifish

Aphyosemion striatum

fishfreshwater
1.5″·10+ gal·peaceful
fish
intermediate

Red-Tailed Black Shark

Epalzeorhynchos bicolor

fishfreshwater
5″·55+ gal·semi-aggr.
fish
Eeasy

Red-Tailed Rasbora

Rasbora borapetensis

fishfreshwater
2″·20+ gal·group 6+·peaceful
fish
Eeasy

Redbreast Acara

Laetacara dorsigera

fishfreshwater
2.5″·20+ gal·peaceful
fish
Eeasy

Redline Dwarf Rasbora

Microrasbora rubescens

fishfreshwater
1″·10+ gal·group 6+·peaceful
fish
Eeasy

Redline Rasbora

Rasbora pauciperforata

fishfreshwater
1.2″·10+ gal·group 6+·peaceful
fish
Mmedium

Redtail Botia

Yasuhikotakia modesta

fishfreshwater
5″·75+ gal·group 3+·semi-aggr.
fish
Xexpert

Regal Angelfish

Pygoplites diacanthus

fishsaltwater
10″·100+ gal·semi-aggr.
fish
beginner

Reticulatus Corydoras

Corydoras reticulatus

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

Rhino Shrimp

Caridina serratirostris

shrimpfreshwater
1.5″·10+ gal·group 8+·peaceful
algae
intermediate

Rhizoclonium

Rhizoclonium sp.

algaefreshwater

Thin, cotton-like green threads that form loose, easily detached clumps — often confused with hair algae but coarser and more tangled. Tends to form clumps rather than sheets. Usually caused by excess ammonia or organics in new tanks. Amano shrimp and Florida Flagfish handle it well.

plant
beginner

Riccia

Riccia fluitans

plantfreshwater

A floating liverwort made famous by Takashi Amano, who pioneered the technique of tying Riccia to rocks and driftwood using hairnets to create lush, bright green carpet-like surfaces. Left floating, it forms a thick mat at the water surface that provides excellent cover for fry and shrimp. When submerged and attached, it releases oxygen bubbles in a process called pearling, creating a spectacular visual effect. It is not a true moss but behaves similarly and is essential in the competition aquascaping world.

fish
beginner

Ricefish

Oryzias woworae

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

Ricordea Florida

Ricordea florida

coralsaltwater
2″·30+ gal·peaceful
coral
beginner

Ricordea Yuma

Ricordea yuma

coralsaltwater
2″·30+ gal·peaceful
shrimp
Eeasy

Rili Red Sakura Shrimp

Neocaridina davidi

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

Rili Shrimp

Neocaridina davidi var. Rili

shrimpfreshwater
1.2″·5+ gal·group 6+·peaceful
plant
intermediate

River Buttercup

Ranunculus inundatus

plantfreshwater

Beautiful foreground or midground plant with distinctive clover-like leaves. Grows in a compact mound. Prefers slightly cooler water and good flow. One of the most unique-looking aquascaping plants.

shrimp
Hhard

Rock Prawn

Macrobrachium lar

shrimpfreshwater
3.5″·20+ gal·aggressive
fish
intermediate

Rope Fish

Erpetoichthys calabaricus

fishfreshwater
15″·55+ gal·peaceful
plant
beginner

Rosanervig Hygrophila

Hygrophila polysperma

plantfreshwater

A stunning variegated cultivar of H. polysperma with white to pink venation against a light green or pinkish leaf. The coloration intensifies under bright light. Despite its exotic appearance it is just as easy as the parent species and grows quickly. Invasive in outdoor ponds in some US states.

plant
intermediate

Rose Moss

Taxiphyllum sp. 'Rose'

plantfreshwater

Rare moss with fronds arranged in rosette patterns resembling tiny roses. Slow-growing and delicate but creates stunning textures.

plant
beginner

Rose Sword

Echinodorus sp. 'Rose'

plantfreshwater

Hybrid sword with pink-tinged new leaves that mature to deep green. Compact size compared to other swords. Popular centrepiece.

fish
intermediate

Rosetail Betta

Betta splendens 'Rosetail'

fishfreshwater
2.5″·5+ gal·semi-aggr.