Shoal & Stem

Species Catalogue

541 species matching your filters — care guides, community photos, water parameters, and tank-mate compatibility.

plant
medium

Rotala H'ra

Rotala sp. 'H'ra'

plantfreshwater
Background·High light·Moderate growth
plant
medium

Rotala Mexicana

Rotala mexicana

plantfreshwater

A delicate fine-leaved stem plant native to Mexico, with small rounded leaves that take on warm pink to orange tones under high light and CO2. Best planted in dense bunches for a feathery, textured effect in the midground or background.

plant
medium

Rotala Pearl

Rotala sp. 'Pearl'

plantfreshwater
Background·Moderate growth
plant
medium

Rotala Ramosior Florida

Rotala ramosior Florida

plantfreshwater
Background·Fast growth
plant
medium

Rotala Rotundifolia Blood Red

Rotala rotundifolia Blood Red

plantfreshwater
Background·Fast growth
plant
medium

Rotala Rotundifolia Colorata

Rotala rotundifolia Colorata

plantfreshwater
Background·Fast growth
plant
medium

Rotala Rotundifolia H'ra

Rotala rotundifolia H'ra

plantfreshwater
Background·Fast growth
plant
medium

Rotala Rotundifolia Orange Juice

Rotala rotundifolia Orange Juice

plantfreshwater
Background·Medium growth
plant
medium

Rotala Singapore

Rotala sp.

plantfreshwater
Midground·Medium to high light·Medium growth
plant
medium

Rotala Sunset

Rotala sp. 'Sunset'

plantfreshwater
Midground·Moderate growth
plant
medium

Rotala Vietnam H'ra

Rotala vietnam H'ra

plantfreshwater
Midground·Medium growth
plant
medium

Rotala Yao Yai

Rotala sp. 'Yao Yai'

plantfreshwater
Midground·Moderate growth
fish
medium

Royal Pleco

Panaque nigrolineatus

fishfreshwater
17″·120+ gal·peaceful
fish
medium

Ruby Tetra

Axelrodia riesei

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

Rummy Nose Rasbora

Sawbwa resplendens

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

Saddleback Clownfish

Amphiprion polymnus

fishsaltwater
4.5″·30+ gal·semi-aggr.
fish
medium

Saddled Bichir

Polypterus endlicheri

fishfreshwater
30″·150+ gal·semi-aggr.
fish
medium

Sailfin Pleco

Pterygoplichthys gibbiceps

fishfreshwater
24″·150+ gal·peaceful
fish
medium

Sailfin Tang

Zebrasoma veliferum

fishsaltwater
15″·100+ gal·semi-aggr.
fish
medium

Salvin's Cichlid

Cichlasoma salvini

fishfreshwater
8″·55+ gal·aggressive
fish
medium

Sardine Cichlid

Cyprichromis leptosoma

fishfreshwater
3.5″·30+ gal·group 6+·peaceful
algae
medium

Sargassum

Sargassum natans

algaesaltwater

The iconic free-floating brown macroalgae of the open ocean — forms dense golden-brown mats in the Sargasso Sea. In aquariums it anchors to rock or tumbles freely. Hosts an entire ecosystem of cryptic animals (pipefish, frogfish, shrimp) in the wild. Challenging to keep long-term but impressive in large displays.

shrimp
medium

Saron Shrimp

Saron marmoratus

shrimpsaltwater
3″·20+ gal·semi-aggr.
fish
medium

Satanoperca Eartheater

Satanoperca leucosticta

fishfreshwater
8″·55+ gal·group 4+·peaceful
fish
medium

Scarlet Badis

Dario dario

fishfreshwater
1″·10+ gal·semi-aggr.
coral
medium

Scolymia

Scolymia sp.

coralsaltwater
2″·30+ gal·peaceful
fish
medium

Senegal Bichir

Polypterus senegalus

fishfreshwater
12″·75+ gal·semi-aggr.
shrimp
medium

Shadow Mosura Shrimp

Caridina logemanni

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

Sharpnose Chocolate Gourami

Sphaerichthys acrostoma

fishfreshwater
1.2″·10+ gal·group 4+·peaceful
algae
medium

Shaving Brush Plant

Penicillus capitatus

algaesaltwater

Unmistakable calcified macroalgae resembling an old-fashioned shaving brush — white stalk topped with a tuft of fine green filaments. Anchors in sandbed. Relatively short-lived (months to a year); when it dies it releases calcium into the water. An endearing curiosity for Caribbean reef displays.

fish
medium

Silver Angelfish

Pterophyllum scalare

fishfreshwater
6″·30+ gal·group 2+·semi-aggr.
fish
medium

Silver Hatchetfish

Gasteropelecus sternicla

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

Six-Barred Panchax

Epiplatys sexfasciatus

fishfreshwater
1.5″·10+ gal·semi-aggr.
fish
medium

Skunk Botia

Yasuhikotakia morleti

fishfreshwater
5″·40+ gal·group 5+·peaceful
fish
medium

Slimy Myersi Kuhli

Pangio myersi

fishfreshwater
3.5″·20+ gal·group 3+·peaceful
fish
medium

Smokey Angelfish

Pterophyllum scalare

fishfreshwater
6″·30+ gal·group 2+·semi-aggr.