Flora & Fauna
673 entries — care guides, placement tips, and notes from the community
Leucomelas Corydoras
Corydoras leucomelas
Lobelia Small Form
Lobelia cardinalis 'Small Form'
Compact rosette plant with spoon-shaped leaves — green on top, vivid purple underneath. One of the most striking two-tone aquascaping plants. Very adaptable and slow-growing. Excellent as a midground accent.
Longfin Zebra Danio
Danio rerio
Loxozonus Corydoras
Corydoras loxozonus
Ludwigia Palustris
Ludwigia palustris
Ludwigia Palustris is one of the most accessible red stem plants, displaying green upper leaf surfaces and deep reddish-pink undersides that are visible as the stems wave in current. It is far less demanding than L. arcuata or Super Red Mini, making it an excellent entry-level red plant for tanks with moderate light. Fast growth means it requires regular pruning to maintain shape.
Ludwigia Super Red
Ludwigia sp. 'Super Red'
Ludwigia Super Red (also sold as Ludwigia sp. 'Red') is the full-size counterpart to Super Red Mini, producing larger oval leaves of intense blood-red to deep crimson coloration under high light and iron dosing. Its vivid, uniform red makes it one of the most striking background plants in aquascaping. Regular trimming and replanting of cuttings maintains colour intensity throughout the stem column.
Ludwigia Super Red Mini
Ludwigia sp. 'Super Red Mini'
Ludwigia Super Red Mini is a highly popular aquascape stem plant producing small, rounded leaves of an intense, uniform blood-red colour that few other plants can match. The compact leaf size and bushy growth habit make it more versatile than larger ludwigia species — it works equally well in nano tanks and as a detailed midground splash of colour in larger aquascapes. Adequate iron and CO2 are key to maintaining colour intensity.
Lyngbya
Lyngbya sp.
Dark, wiry filaments of cyanobacteria that form dense mats — often mistaken for BBA. Unlike true algae, it can fix atmospheric nitrogen, meaning low nitrogen levels do not suppress it. Produces toxins harmful to invertebrates. Requires the same treatment as blue-green algae: blackout, H₂O₂ treatment, and improved flow.
Macropterus Corydoras
Corydoras macropterus
Mahachai Betta
Betta mahachaiensis
Betta mahachaiensis is a wild betta discovered in 2012 in the brackish coastal habitats of Samut Sakhon, Thailand — making it unique among bettas in its tolerance for slightly saline conditions. Males display striking iridescent teal-blue scale edging similar to B. smaragdina. It builds bubble nests and is less aggressive than B. splendens toward other species. Its restricted wild range makes it important for conservation-minded hobbyists.
Malabar Danio
Devario malabaricus
Malaysian Trumpet Snail
Melanoides tuberculata
Malaysian trumpet snails are beneficial substrate dwellers that burrow through gravel and sand, aerating it and preventing the build-up of toxic anaerobic pockets. They are predominantly nocturnal and are often only seen at night. Populations can explode with excess food, but remain in check with controlled feeding.
Marble Angelfish
Pterophyllum scalare
A captive-bred variety with a swirling black-and-white marbled pattern caused by the marble gene. The pattern is unpredictable and no two fish look alike. One of the most widely kept angelfish morphs, well suited to planted scapes.
Marble Betta
Betta splendens 'Marble'
Marble Bettas carry a transposon-driven colour mutation discovered in the 1970s that causes random, irregular patches of pigmentation. One of their most fascinating traits is colour instability — a marble betta can spontaneously change colour pattern over its lifetime as the transposon activates or silences pigment genes. This unpredictability makes every individual unique and constantly surprising to their owners.
Marbled Hatchetfish
Carnegiella strigata
Smallest hatchetfish with intricate brown-and-gold marbled patterning. A delicate but fascinating surface fish. Needs a very tight-fitting lid as it can jump significant distances.
Marimo Moss Ball
Aegagropila linnaei
Beloved velvety-green spheres of filamentous green algae — not a moss at all. Forms naturally in cold lakes where wave action rolls colonies into balls over decades. A low-maintenance aquarium icon that grows extremely slowly. Rotate occasionally for even light exposure.
Marsilea Crenata
Marsilea crenata
The most popular carpeting Marsilea in the hobby, producing tiny two- or four-leaf clovers on short petioles that hug the substrate to form a dense, bright green carpet. Significantly smaller than M. hirsuta, making it better suited to nano tanks and foreground work in larger scapes. Grows reliably with good light and CO₂ but is surprisingly tolerant of lower-tech conditions compared to HC Cuba. The clover-shaped leaves are charming and create an instantly recognisable, naturalistic foreground.
Marsilea Minuta
Marsilea minuta
The smallest Marsilea species commonly available, producing miniscule two-leaf forms when submerged that create an incredibly fine, lawn-like carpet. Its wide geographic distribution makes it very adaptable to different water conditions. Under high light it carpets tightly to the substrate; in lower light, petioles elongate as the plant reaches for the surface. One of the most low-maintenance carpeting options available — more forgiving than HC Cuba or E. Belem.
Mato Grosso Milfoil
Myriophyllum mattogrossense
Lush, feathery stem plant with fine bright-green whorled leaves. Faster-growing and more forgiving than its red cousin. Creates a spectacular soft texture in the background of planted tanks.
Mayaca Fluviatilis
Mayaca fluviatilis
A beautiful, moss-like stem plant with densely packed, fine, bright green leaves that give stems a cylindrical, fluffy appearance. It grows in flowing, well-oxygenated water in the wild. Prefers soft, slightly acidic conditions and benefits from CO2. Often used in Dutch scapes as a light green accent column.
Melanistius Corydoras
Corydoras melanistius
Mermaid Weed
Proserpinaca palustris
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.
Mexican Oak Leaf
Shinnersia rivularis
Fast-growing stem plant with distinctive oak-leaf-shaped leaves. Extremely easy and undemanding — grows well without CO2. The unusual leaf shape adds variety to planted tank backgrounds.
Micrantha Lily
Nymphaea micrantha
Small water lily that propagates prolifically from plantlets on its floating leaves. Produces striking red-spotted green pads. Remove surface leaves regularly to keep the plant growing compact submersed growth.
Microsorum Trident
Microsorum pteropus 'Trident'
The trident java fern is a cultivar with deeply lobed, multi-pronged fronds that create an elegant, fern-like silhouette. Like all java ferns it attaches to hardscape and requires no substrate. Very low-maintenance and suitable for low-tech tanks.
Mini Bolbitis
Bolbitis difformis
Sometimes sold as 'Baby Bolbitis' or 'Mini Bolbitis', this small aquatic fern produces deeply divided fronds similar to the full-size Bolbitis heudelotii but significantly more compact and fine-textured. It attaches to driftwood and rock and grows well in moderate flow. One of the finest detail ferns in the hobby for Iwagumi and Nature Aquarium style.
Mini Christmas Moss
Vesicularia montagnei
A smaller, more delicate version of Christmas Moss with finer fronds arranged in the same classic triangular pattern. The smaller frond size allows for more detailed, intricate-looking moss walls and carpets compared to standard Christmas Moss. Like other Vesicularia species, it attaches readily to hardscape and can be tied, glued, or pressed onto mesh panels. Works especially well in nano tanks and detailed scapes where a finer texture is desired.
Mini Eriocaulon
Eriocaulon cinereum
Tiny rosette plant forming grass-like tufts. One of the most challenging aquarium plants to keep long-term. Needs very soft, acidic water, strong light, and CO2.
Mini Pellia
Riccardia chamedryfolia
Mini Pellia is a small liverwort that grows as a low, spreading cushion of dark green, branching thallus. It attaches readily to rock and wood and is prized for its dense, velvety texture in Nature Aquarium compositions. Slower growing and more demanding than Java Moss, it prefers cooler, well-oxygenated water with CO2.
Molly
Poecilia sphenops
Mollies are versatile livebearers available in many colour forms including black, dalmatian, and balloon. They are adaptable to a wide range of conditions including brackish water. Females give birth to live young and breed prolifically in captivity.
Moneywort
Bacopa monnieri
A classic beginner stem plant with thick, succulent-looking round leaves arranged in opposite pairs along stiff stems. Growth is slow to moderate, making it easy to maintain shape. It adapts to a wide range of conditions and does not need CO2 to thrive, making it one of the most versatile aquatic plants available.
Monte Carlo
Micranthemum tweediei
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.
Moonlight Gourami
Trichopodus microlepis
Elegant silver gourami with a subtle moonlit sheen and orange-red ventral fins. One of the most peaceful and graceful labyrinth fish. Works beautifully in a tall, well-planted aquarium.
Mosquito Rasbora
Boraras brigittae
One of the smallest schooling fish in the hobby at just 0.8 inches. Deep red body with a black lateral spot. Thrives in blackwater planted nano tanks. Looks extraordinary in groups of 20+ against green plants.
Mosquitofish
Gambusia affinis
Mosquitofish are exceptionally hardy, adaptable livebearers that have been deliberately introduced worldwide for mosquito larvae control. They consume prodigious quantities of surface larvae and can survive conditions — extreme heat, cold, salinity, low oxygen — lethal to most aquarium fish. Note that they are aggressive fin nippers and should not be housed with fancy-finned fish; they are best suited to utility or outdoor pond use rather than display aquariums.
Mystery Snail
Pomacea bridgesii
Mystery snails are large, attractive freshwater snails that come in a range of shell colours from gold to blue-grey. They are peaceful algae grazers and scavengers that will clean up uneaten food and detritus. They have a trap door (operculum) that allows them to seal the shell, surviving brief periods out of water.