Shoal & Stem

Species Catalogue

1,570 species — care guides, community photos, water parameters, and tank-mate compatibility.

fish
easy

Pygmy Rasbora

Boraras maculatus

fishfreshwater
0.8″·5+ gal·group 8+·peaceful
fish
hard

Queen Angelfish

Holacanthus ciliaris

fishsaltwater
18″·250+ gal·semi-aggr.
fish
easy

Queen Danio

Devario regina

fishfreshwater
2.5″·25+ gal·group 6+·peaceful
fish
medium

Queen Loach

Botia dario

fishfreshwater
5″·40+ gal·group 3+·semi-aggr.
plant
medium

Queen Moss

Hydropogonella gymnostoma

plantfreshwater
Epiphyte·Slow growth
plant
medium

Quillwort

Isoetes velata

plantfreshwater
Foreground·Slow growth
fish
easy

Rabauti Corydoras

Corydoras rabauti

fishfreshwater
2″·15+ gal·group 6+·peaceful
fish
medium

Raccoon Butterflyfish

Chaetodon lunula

fishsaltwater
8″·75+ gal·peaceful
fish
medium

Rainbow Cichlid

Herotilapia multispinosa

fishfreshwater
5″·30+ gal·semi-aggr.
crab
expert

Rainbow Crab

Cardisoma armatum

crabfreshwater
5″·40+ gal·aggressive
fish
medium

Rainbow Emperor Tetra

Nematobrycon lacortei

fishfreshwater
2″·15+ gal·group 6+·peaceful
fish
easy

Rainbow Platy

Xiphophorus maculatus

fishfreshwater
2.5″·10+ gal·group 3+·peaceful
fish
medium

Ranchu Goldfish

Carassius auratus

fishfreshwater
7″·20+ gal·peaceful
fish
hard

Red Arc Pencilfish

Nannostomus mortenthaleri

fishfreshwater
1.4″·15+ gal·group 8+·peaceful
shrimp
easy

Red Babaulti Shrimp

Caridina babaulti

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

Red Chest Endler

Poecilia wingei

fishfreshwater
1.2″·5+ gal·group 3+·peaceful
crab
medium

Red Claw Crab

Perisesarma bidens

crabfreshwater
2″·20+ gal·semi-aggr.
invertebrate
medium

Red Claw Crayfish

Cherax quadricarinatus

invertebratefreshwater
12″·75+ gal·aggressive
shrimp
expert

Red Claw Macro

Macrobrachium assamense

shrimpfreshwater
5.9″·30+ gal·aggressive
fish
hard

Red Devil Cichlid

Amphilophus labiatus

fishfreshwater
12″·75+ gal·aggressive
fish
easy

Red Devil Molly

Poecilia sphenops

fishfreshwater
3″·15+ gal·group 3+·peaceful
fish
easy

Red Dwarf Gourami

Trichogaster lalius

fishfreshwater
3.5″·15+ gal·semi-aggr.
shrimp
hard

Red Galaxy Pinto Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
algae
easy

Red Gracilaria

Gracilaria sp.

algaesaltwater

Bushy red-to-burgundy macroalgae prized as live food for herbivorous fish — tangs, rabbitfish, and urchins graze on it enthusiastically. Also an excellent nutrient exporter in refugia. Tumbles well under flow and tolerates a wide range of conditions.

algae
medium

Red Grape Algae

Botryocladia sp.

algaesaltwater

Rare and coveted — clusters of translucent, deep-red spherical bladders like bunches of miniature grapes. A showpiece macroalgae that attaches to live rock. Slow-growing and sensitive; requires stable, high-quality water. Highly sought after for display refugia and naturally deters herbivorous fish.

fish
medium

Red Hook Silver Dollar

Myloplus rubripinnis

fishfreshwater
3.5″·75+ gal·group 6+·peaceful
fish
medium

Red Hump Eartheater

Geophagus steindachneri

fishfreshwater
7″·55+ gal·group 4+·peaceful
fish
easy

Red Jewel Cichlid

Hemichromis lifalili

fishfreshwater
5″·30+ gal·aggressive
shrimp
medium

Red King Kong Shrimp

Caridina cantonensis

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

Red Line Shrimp

Caridina thambipillai

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

Red Lip Nerite Snail

Neritina waigiensis

snailfreshwater
0.75″·5+ gal·peaceful
fish
medium

Red Melon Badis

Dario hysginon

fishfreshwater
0.8″·10+ gal·peaceful
fish
medium

Red Neon Blue Eye

Pseudomugil luminatus

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

Red Oscar

Astronotus ocellatus

fishfreshwater
14″·75+ gal·semi-aggr.
fish
easy

Red Phantom Tetra

Megalamphodus sweglesi

fishfreshwater
1.5″·15+ gal·group 6+·peaceful
fish
easy

Red Platy

Xiphophorus maculatus

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