Shoal & Stem

Species Catalogue

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

shrimp
hard

Crystal Black Shrimp

Caridina cantonensis 'Crystal Black'

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

Cuphea Anagalloidea

Cuphea anagalloidea

plantfreshwater
Midground·Very growth
fish
hard

Demasoni Cichlid

Pseudotropheus demasoni

fishfreshwater
3″·55+ gal·group 12+·aggressive
algae
hard

Derbesia

Derbesia sp.

algaesaltwater

Fine, fluffy dark green tufts that resemble a softer version of Bryopsis. Often appears in high-nutrient systems and around powerhead intakes. Like Bryopsis it is resistant to most herbivores. Sea hares will consume it; magnesium treatment (1500–1800 ppm) is effective. Reducing phosphate below 0.05 ppm also helps.

algae
hard

Dictyota

Dictyota sp.

algaesaltwater

Flat, iridescent brown-olive blades that spread over rockwork and corals. Beautiful under certain lighting — shimmers blue-green — but highly invasive in reef tanks. Produces chemical deterrents that most fish avoid. Very difficult to eliminate; manual removal stimulates regrowth. Sea urchins (Diadema) and Thalassoma wrasses occasionally graze it.

algae
hard

Dinoflagellates

Symbiodinium spp.

algaesaltwater

Brown, stringy, bubble-filled slime that often appears in new reef tanks — frequently mistaken for cyanobacteria. Dinoflagellates ('dinos') form slimy mats that can smother corals and sandbed. Treatment is complex: raise nitrates (>2 ppm), raise phosphates (>0.05 ppm), run extended dark periods, and increase UV sterilisation. One of the most frustrating reef nuisances.

fish
hard

Duboisi Cichlid

Tropheus duboisi

fishfreshwater
5″·75+ gal·group 6+·aggressive
plant
hard

Dwarf Baby Tears

Hemianthus callitrichoides

plantfreshwater

The smallest aquarium plant in the world, native to Cuba. Forms a dense bright green carpet highly prized in Nature Aquariums and iwagumi layouts. Requires high light, CO₂ injection, and a nutrient-rich substrate to thrive.

fish
hard

Elephant Nose Fish

Gnathonemus petersii

fishfreshwater
9″·50+ gal·semi-aggr.
fish
hard

Elizabeth's Dwarf Cichlid

Apistogramma elizabethae

fishfreshwater
3″·20+ gal·semi-aggr.
fish
hard

Emperor Angelfish

Pomacanthus imperator

fishsaltwater
15″·150+ gal·semi-aggr.
plant
hard

Eriocaulon King Crimson

Eriocaulon sp. 'King Crimson'

plantfreshwater
Midground·Slow growth
plant
hard

Eriocaulon Polaris

Eriocaulon sp. 'Polaris'

plantfreshwater
Foreground·Slow growth
plant
hard

Eriocaulon Quinquangulare

Eriocaulon quinquangulare

plantfreshwater
Midground·Slow growth
plant
hard

Eriocaulon Vietnam

Eriocaulon sp. 'Vietnam'

plantfreshwater
Foreground·Slow growth
shrimp
hard

Extreme Black King Kong Shrimp

Caridina logemanni

shrimpfreshwater
1.5″·10+ gal·group 10+·peaceful
shrimp
hard

Extreme Panda Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
shrimp
hard

Extreme Red King Kong Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
fish
hard

Fahaka Puffer

Tetraodon lineatus

fishfreshwater
18″·125+ gal·aggressive
fish
hard

Fire Eel

Mastacembelus erythrotaenia

fishfreshwater
36″·80+ gal·semi-aggr.
plant
hard

Fissidens Nobilis

Fissidens nobilis

plantfreshwater
Epiphyte
shrimp
hard

Flowerhead Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
fish
hard

Freshwater Pipefish

Doryichthys martensii

fishfreshwater
7″·20+ gal·peaceful
shrimp
hard

Galaxy Pinto Shrimp

Caridina logemanni

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
shrimp
hard

Giant River Prawn

Macrobrachium rosenbergii

shrimpfreshwater
8″·55+ gal·peaceful
plant
hard

Glossostigma

Glossostigma elatinoides

plantfreshwater
Carpet·Very high light·Fast growth
fish
hard

Gold Nugget Pleco

Baryancistrus xanthellus

fishfreshwater
10″·55+ gal·semi-aggr.
fish
hard

Golden Discus

Symphysodon sp.

fishfreshwater
6″·55+ gal·group 4+·peaceful
coral
hard

Goniopora

Goniopora sp.

coralsaltwater
2″·30+ gal·peaceful
fish
hard

Jaguar Cichlid

Parachromis managuensis

fishfreshwater
16″·75+ gal·aggressive
shrimp
hard

King Kong Shrimp

Caridina cantonensis

shrimpfreshwater
1.2″·5+ gal·group 6+·peaceful
fish
hard

L081 Gold Nugget Pleco Medium Spot

Baryancistrus sp. L081

fishfreshwater
8″·75+ gal·peaceful
fish
hard

L177 Gold Nugget Pleco

Baryancistrus sp. L177

fishfreshwater
9″·75+ gal·peaceful
fish
hard

L236 White Line Tiger Pleco

Hypancistrus sp. L236

fishfreshwater
3.5″·20+ gal·peaceful
fish
hard

Leopard Discus

Symphysodon sp.

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

Leopold's Angelfish

Pterophyllum leopoldi

fishfreshwater
4″·30+ gal·group 2+·semi-aggr.