Shoal & Stem

Species Catalogue

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

plant
Mmedium

Pogostemon Yatabeanus

Pogostemon yatabeanus

plantfreshwater

Pogostemon yatabeanus is a vibrant stem plant native to Southeast Asia, prized for its distinctive narrow, lance-shaped leaves that display rich green coloration with reddish undersides under strong lighting. This plant exhibits a compact, bushy growth habit and is moderately fast-growing, making it an excellent choice for midground placement in planted aquariums.

fish
Mmedium

Polka Dot Loach

Botia kubotai

fishfreshwater
4″·40+ gal·group 3+·peaceful
fish
beginner

Polystictus Corydoras

Corydoras polystictus

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

Pom Pom Crab

Ptychognathus barbatus

crabfreshwater
0.75″·10+ gal·peaceful
fish
intermediate

Pompom Goldfish

Carassius auratus

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

Pond Snail

Lymnaea stagnalis

snailfreshwater
2″·10+ gal·peaceful
fish
intermediate

Porcupine Puffer

Diodon holocanthus

fishsaltwater
12″·100+ gal·semi-aggr.
coral
intermediate

Porites Coral

Porites lobata

coralsaltwater
2″·30+ gal·peaceful
fish
beginner

Porthole Catfish

Dianema urostriata

fishfreshwater
4″·30+ gal·group 4+·peaceful
shrimp
Mmedium

Poso Orange Shrimp

Caridina glaubrechti

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

Potamogeton Octandrus

Potamogeton octandrus

plantfreshwater

Delicate pondweed with thin, translucent leaves that sway in current. Creates a very natural, river-like appearance. Spreads by runners.

fish
advanced

Potter's Angelfish

Centropyge potteri

fishsaltwater
5″·55+ gal·semi-aggr.
fish
intermediate

Powder Blue Dwarf Gourami

Trichogaster lalius

fishfreshwater
3.5″·15+ gal·semi-aggr.
fish
advanced

Powder Blue Tang

Acanthurus leucosternon

fishsaltwater
9″·100+ gal·semi-aggr.
plant
intermediate

Proserpinaca Palustris

Proserpinaca palustris

plantfreshwater

Mermaid Weed is a unique stem plant that changes leaf shape depending on whether it is emersed or submersed — submerged leaves are deeply serrated and comb-like, while emersed leaves are broader and simple. Under high light the deeply lobed leaves turn intense shades of orange and red, making it a striking colour accent in Dutch and Nature Aquarium layouts.

coral
beginner

Pulsing Xenia

Xenia spp.

coralsaltwater
2″·30+ gal·peaceful
shrimp
Eeasy

Pumpkin Shrimp

Neocaridina davidi

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

Purple Firefish

Nemateleotris decora

fishsaltwater
3.5″·20+ gal·group 2+·peaceful
plant
advanced

Purple Ludwigia

Ludwigia glandulosa

plantfreshwater

Narrow-leaved Ludwigia that turns deep maroon-purple under high light. One of the most intensely coloured aquatic plants available. Slow-growing but spectacular. Requires CO2 and strong light to stay compact.

snail
beginner

Purple Mystery Snail

Pomacea bridgesii

snailfreshwater
2″·5+ gal·peaceful
shrimp
beginner

Purple Neocaridina

Neocaridina davidi

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

Purple Sea Fan

Gorgonia ventalina

coralsaltwater
2″·30+ gal·peaceful
fish
intermediate

Purple Tang

Zebrasoma xanthurum

fishsaltwater
8″·75+ gal·semi-aggr.
plant
beginner

Purple-backed Duckweed

Ricciocarpus natans

plantfreshwater

Heart-shaped floating liverwort with purple undersides. Larger than common duckweed and far easier to manage. Provides excellent shade.

plant
intermediate

Pygmy Chain Sword

Echinodorus tenellus

plantfreshwater

Echinodorus Tenellus, the Pygmy Chain Sword, is a dwarf sword plant that forms a low, grass-like foreground carpet via prolific runners. Its narrow, strap-like leaves rarely exceed 10 cm, making it one of the few true sword plants suitable for foreground use. Under good lighting and CO2 it spreads rapidly; without CO2 growth is slower but still achievable.

plant
beginner

Pygmy Chain Sword Red

Helanthium tenellum 'Red'

plantfreshwater

Red-tinted form of the Pygmy Chain Sword. Develops reddish-brown tones under higher light. Low-maintenance carpeting plant.

Pygmy Corydorasbeginner

Pygmy Corydoras

Corydoras pygmaeus

fishfreshwater
1″·10+ gal·group 8+·peaceful
fish
intermediate

Pygmy Hatchetfish

Carnegiella myersi

fishfreshwater
1″·10+ gal·group 8+·peaceful
fish
beginner

Pygmy Rasbora

Boraras maculatus

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

Queen Angelfish

Holacanthus ciliaris

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

Queen Danio

Devario regina

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

Queen Loach

Botia dario

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

Queen Moss

Hydropogonella gymnostoma

plantfreshwater

Large, feathery aquatic moss with branching fronds reminiscent of tiny fern leaves. Creates a lush, jungle-like appearance on hardscape.

plant
intermediate

Quillwort

Isoetes velata

plantfreshwater

Ancient, grass-like plant with quill-shaped leaves growing from a corm. Creates a unique tuft-grass look. Thrives in nutrient-rich substrate.

fish
beginner

Rabauti Corydoras

Corydoras rabauti

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

Raccoon Butterflyfish

Chaetodon lunula

fishsaltwater
8″·75+ gal·peaceful