Shoal & Stem

Species Catalogue

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

fish
beginner

Molly

Poecilia sphenops

fishfreshwater
3″·15+ gal·group 3+·peaceful
plant
intermediate

Monte Carlo

Micranthemum tweediei

plantfreshwater

Monte carlo produces small, round leaves on creeping stems and is widely used as a foreground carpet alternative to hairgrass. It requires moderate to high light and CO2 injection to spread horizontally rather than growing upward. Its bright green colour adds a vivid pop to Nature Aquarium-style aquascapes.

coral
advanced

Montipora

Montipora sp.

coralsaltwater
2″·40+ gal·peaceful
fish
beginner

Moonlight Gourami

Trichopodus microlepis

fishfreshwater
6″·30+ gal·peaceful
fish
advanced

Moorish Idol

Zanclus cornutus

fishsaltwater
9″·100+ gal·peaceful
fish
beginner

Mosaic Guppy

Poecilia reticulata

fishfreshwater
2″·10+ gal·group 3+·peaceful
fish
beginner

Moscow Blue Guppy

Poecilia reticulata

fishfreshwater
2″·10+ gal·group 3+·peaceful
fish
beginner

Moscow Guppy

Poecilia reticulata

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

Mosquito Fern

Azolla pinnata

plantfreshwater

Mosquito Fern is a small, floating aquatic fern with delicate, feathery fronds that form dense mats on the water surface. It displays distinctive reddish or brownish coloration under high light and nutrient-rich conditions. This fast-growing plant is excellent for shading and nutrient export, making it ideal for beginner aquarists.

Mosquitofishbeginner

Mosquitofish

Gambusia affinis

fishfreshwater
2.5″·10+ gal·semi-aggr.
shrimp
Hhard

Mosura Pinto Shrimp

Caridina logemanni

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

Mosura Shrimp

Caridina logemanni

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

Mudskipper

Periophthalmus barbarus

fishbrackish
6″·30+ gal·semi-aggr.
fish
beginner

Multi Shell Dweller

Neolamprologus multifasciatus

fishfreshwater
1.5″·10+ gal·semi-aggr.
plant
beginner

Murdannia Keisak

Murdannia keisak

plantfreshwater

Pink-stemmed plant with narrow leaves. Develops beautiful pink-red colouration even under moderate light. Very easy red/pink stem plant.

coral
beginner

Mushroom Coral

Actinodiscus spp.

coralsaltwater
2″·20+ gal·peaceful
plant
beginner

Myriophyllum Aquaticum

Myriophyllum aquaticum

plantfreshwater

Parrot's Feather is a fast-growing, feathery stem plant with blue-green whorled leaves. It grows both submerged and emersed. Excellent for ponds and unheated tanks. Grows vigorously without CO2, absorbing nutrients rapidly and helping suppress algae. In warm tanks it may require pruning weekly to keep it manageable.

plant
intermediate

Myriophyllum Guyana

Myriophyllum sp. 'Guyana'

plantfreshwater

Very fine, feathery stem plant with orange-red tips under strong light. Creates a soft, cloud-like effect in backgrounds.

plant
intermediate

Myriophyllum Mattogrossense

Myriophyllum mattogrossense

plantfreshwater

Myriophyllum mattogrossense produces feathery red-green whorled leaves on reddish stems, creating an ornate background plant. Under high light and CO2 the foliage intensifies to deep burgundy. It is a fast grower that needs regular trimming.

plant
intermediate

Myriophyllum Tuberculatum

Myriophyllum tuberculatum

plantfreshwater

Red Foxtail is one of the deepest red aquatic plants available. It produces whorls of fine, needle-like leaves that range from orange-red to blood-red under intense light. The feathery texture combined with vivid colouration makes it a showpiece background plant in high-tech scapes. Demanding of light, CO2, and micronutrients.

snail
beginner

Mystery Snail

Pomacea bridgesii

snailfreshwater
2″·5+ gal·peaceful
fish
intermediate

Mystery Wrasse

Pseudocheilinus ocellatus

fishsaltwater
5″·30+ gal·semi-aggr.
plant
beginner

Najas Guadalupensis

Najas guadalupensis

plantfreshwater

Known as Guppy Grass or Najas Grass, this fast-growing, fine-leaved plant is a superb filtration plant and spawning medium. It floats freely or can be weighted down. Its vigorous growth absorbs excess nutrients, helping combat algae. Very tolerant of a wide range of water conditions.

fish
intermediate

Narcissus Corydoras

Corydoras narcissus

fishfreshwater
2.5″·15+ gal·group 6+·peaceful
plant
Eeasy

Narrow Leaf Java Fern

Microsorum pteropus Narrow Leaf

plantfreshwater

Narrow Leaf Java Fern is a slender, elegant variant of the popular Java Fern with distinctly thin, needle-like fronds that create a delicate, feathery appearance. This slow-growing epiphytic fern thrives in low to medium light and requires no CO2, making it ideal for beginner aquarists. Its compact growth habit and attractive foliage make it perfect for attaching to rocks or driftwood in any freshwater setup.

plant
beginner

Narrow Leaf Marsilea

Marsilea angustifolia

plantfreshwater

Low-growing fern that forms a carpet of narrow, single or double-lobed leaves. Very easy and adaptable foreground plant.

plant
beginner

Narrow Leaf Sagittaria

Sagittaria subulata var. gracillima

plantfreshwater

Extra-narrow form of Dwarf Sagittaria. Grass-like appearance. Spreads quickly by runners. Great low-tech carpet/foreground option.

plant
beginner

Narrowleaf Temple Plant

Hygrophila corymbosa

plantfreshwater

Narrow, willowy leaves give this variant a graceful, feathery appearance unlike its broad-leafed relatives. Great for creating visual contrast alongside wider-leaved plants. Just as hardy as the parent species.

fish
intermediate

Naso Tang

Naso lituratus

fishsaltwater
18″·150+ gal·semi-aggr.
snail
beginner

Nassarius Snail

Nassarius sp.

snailsaltwater
1.5″·10+ gal·peaceful
fish
beginner

Nattereri Corydoras

Corydoras nattereri

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

Needle Hairgrass

Eleocharis acicularis

plantfreshwater

Eleocharis Acicularis, Needle Hairgrass, produces extremely fine, hair-like leaves that are noticeably thinner and longer than the closely related E. parvula, creating a delicate, windswept grass carpet effect. It requires good light and CO2 to spread vigorously via runners; without injection it grows slowly and sparsely. Regular trimming keeps the carpet dense and lush.

plant
Eeasy

Needle Leaf Java Fern

Microsorum pteropus Needle Leaf

plantfreshwater

Needle Leaf Java Fern is a slender, delicate variant of the popular Java Fern with thin, needle-like leaves that create an elegant, feathery appearance. This rhizome-based epiphyte is extremely hardy and requires no substrate rooting, making it ideal for attaching to rocks or driftwood. It thrives in low to medium light and is one of the easiest aquatic plants for beginners.

algae
intermediate

Neomeris

Neomeris annulata

algaesaltwater

Tiny, elegant calcified algae with a barrel-shaped body ringed with white calcium bands at the tip. Short-lived (weeks to months) but reproduces readily in stable reef tanks. An interesting hitchhiker and occasional deliberate addition. Fish tend to leave it alone due to calcification.

fish
beginner

Neon Blue Dwarf Gourami

Trichogaster lalius

fishfreshwater
3.5″·10+ gal·peaceful
fish
beginner

Neon Dwarf Gourami

Trichogaster lalius

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