Shoal & Stem

Species Catalogue

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

fish
intermediate

Pearlscale Goldfish

Carassius auratus

fishfreshwater
6″·20+ gal·group 2+·peaceful
plant
beginner

Pellia Moss

Monosolenium tenerum

plantfreshwater

A flat, ribbon-like liverwort with a deep green, glossy surface that forms dense, spreading sheets on hardscape or the substrate. It is not a true moss but is widely sold and used as one. Particularly popular in shrimp and nano tanks — the flat, broad fronds create excellent grazing and hiding surfaces for dwarf shrimp. Grows slowly and does not need attachment, but its dense structure means it can smother smaller plants if left unchecked.

fish
beginner

Pencilfish

Nannostomus beckfordi

fishfreshwater
2″·10+ gal·group 6+·peaceful
fish
beginner

Penguin Tetra

Thayeria boehlkei

fishfreshwater
2.5″·20+ gal·group 6+·peaceful
fish
beginner

Peppered Corydoras

Corydoras paleatus

fishfreshwater
2.75″·20+ gal·group 6+·peaceful
shrimp
beginner

Peppermint Shrimp

Lysmata wurdemanni

shrimpsaltwater
2″·20+ gal·group 3+·peaceful
plant
intermediate

Persicaria Kawagoeanum

Persicaria kawagoeanum

plantfreshwater

A rare and highly distinctive stem plant with tiny, deeply lobed, reddish leaves that give it the appearance of a miniature oak tree underwater. Extremely sought-after in high-tech planted tanks. Requires strong light, CO2, and micronutrient-rich fertilisation to display its best colouration.

plant
intermediate

Persicaria São Paulo

Persicaria sp. 'São Paulo'

plantfreshwater

Narrow, lance-shaped leaves that develop pink to red coloration. A less demanding alternative to high-tech red plants. Fast grower.

plant
Eeasy

Philippine Java Fern

Leptochilus decurrens

plantfreshwater

Philippine Java Fern is a hardy, slow-growing rhizome plant with narrow, deeply lobed fronds that create an elegant, feathery appearance. It thrives in low to medium light and requires no CO2, making it ideal for beginner aquarists. This epiphytic fern attaches to wood and rock, adding natural texture and shade to any aquascape.

fish
beginner

Phoenix Rasbora

Boraras merah

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

Picasso Triggerfish

Rhinecanthus aculeatus

fishsaltwater
12″·100+ gal·aggressive
fish
beginner

Pictus Catfish

Pimelodus pictus

fishfreshwater
4.5″·55+ gal·group 3+·peaceful
fish
advanced

Pigeon Blood Discus

Symphysodon sp.

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

Pike Cichlid

Crenicichla sp.

fishfreshwater
10″·55+ gal·aggressive
fish
Xexpert

Pikehead

Luciocephalus pulcher

fishfreshwater
8″·40+ gal·aggressive
fish
beginner

Pineapple Platy

Xiphophorus maculatus

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

Pineapple Swordtail

Xiphophorus hellerii

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

Pink Ramshorn Snail

Planorbarius corneus

snailfreshwater
0.75″·5+ gal·peaceful
fish
beginner

Pink Skunk Clownfish

Amphiprion perideraion

fishsaltwater
4″·30+ gal·group 2+·semi-aggr.
shrimp
Mmedium

Pinocchio Shrimp

Caridina gracilirostris

shrimpfreshwater
1.2″·10+ gal·group 6+·peaceful
shrimp
advanced

Pinto Shrimp

Caridina cantonensis var. 'Pinto'

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

Pipe Organ Coral

Tubipora musica

coralsaltwater
2″·30+ gal·peaceful
shrimp
beginner

Pistol Shrimp

Alpheus randalli

shrimpsaltwater
2″·20+ gal·semi-aggr.
fish
beginner

Plakat Betta

Betta splendens 'Plakat'

fishfreshwater
2.5″·5+ gal·semi-aggr.
fish
beginner

Platinum Guppy

Poecilia reticulata

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

Platinum Hatchetfish

Thoracocharax stellatus

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

Platinum Molly

Poecilia sphenops

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

Platy

Xiphophorus maculatus

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

Pocillopora

Pocillopora spp.

coralsaltwater
2″·50+ gal·peaceful
plant
intermediate

Pogostemon Deccanensis

Pogostemon deccanensis

plantfreshwater

Fine-leaved stem plant with whorls of needle-like leaves. Creates a very different texture from typical plants. Good CO2 response.

plant
intermediate

Pogostemon Erectus

Pogostemon erectus

plantfreshwater

Pogostemon erectus is a striking stem plant with needle-like whorled leaves arranged in perfect spirals around each stem. It creates a distinctive, almost Christmas-tree silhouette. It requires CO2 and good nutrients to maintain its compact, fine-textured form.

plant
intermediate

Pogostemon Helferi

Pogostemon helferi

plantfreshwater

Pogostemon helferi (Downoi or Little Star) is a distinctive, star-shaped rosette plant from Thailand with deeply ruffled, wavy-edged bright-green leaves radiating from a central crown. It grows low (5–8 cm) and is one of the few compact foreground rosette plants with real textural interest. It requires medium to high light and benefits from CO2 and soft, slightly acidic water. Popular in detailed Iwagumi and Nature Aquarium aquascapes.

plant
intermediate

Pogostemon Kimberley

Pogostemon sp. 'Kimberley'

plantfreshwater

Compact stem plant with dense, bushy growth. Fine-leaved with green to yellow-green coloration. Good midground choice.

plant
intermediate

Pogostemon Quadrifolius

Pogostemon quadrifolius

plantfreshwater

Tall stem plant with whorls of four narrow leaves at each node. Creates a very distinctive layered look. Moderate difficulty.

plant
intermediate

Pogostemon Stellatus

Pogostemon stellatus

plantfreshwater

Pogostemon Stellatus is a majestic background stem plant that produces whorls of up to eight narrow leaves per node, creating a star-burst pattern. Under intense light the leaves develop beautiful pinkish-purple tones. It grows tall and is best positioned in the background. Nutrient-hungry and demanding of CO2 but rewarding when conditions are right.

plant
Mmedium

Pogostemon Stellatus Octopus

Pogostemon stellatus Octopus

plantfreshwater

Pogostemon stellatus Octopus is a vibrant stem plant featuring distinctive reddish-purple coloration and uniquely branched, octopus-like foliage that becomes more pronounced under high light. This cultivar is prized for its ornamental appeal and relatively straightforward care requirements compared to other demanding stem plants.