Thai trapdoor snail

Geographical Origin & Biotope:

The White Wizard Snail, also known scientifically as the Thai Trapdoor Snail (*Filopaludina martensi*), is a highly fascinating, robust freshwater gastropod natively endemic to the warm, heavily vegetated, slow-moving rivers, deep ponds, and flooded rice paddies of Southeast Asia (primarily Thailand, Cambodia, and Malaysia). Their natural biotope is defined by sluggish, highly oxygenated waters over deep, soft, mud bottoms where they function as heavy-duty filter feeders and substrate scavengers.

Taxonomy & Morphology:

Scientifically classified within the Viviparidae (River Snail) family, they are large and visually striking. Fully mature adults can easily reach 4.0 to 5.0 centimeters (1.6-2.0 inches) in diameter. They are instantly recognizable by their massive, rounded, globe-like conical shell that is distinctly shorter and much thicker than Rabbit Snails. They are "trapdoor" snails, possessing an incredibly thick, hard operculum to seal themselves tightly inside. They breathe underwater via highly efficient gills.

Social Behavior:

They are completely peaceful, slow-moving, and notoriously secretive giants. Unlike hyperactive Ramshorns, White Wizard Snails are highly methodical. They spend a vast majority of their time partially or fully buried in soft substrate, using their specialized gills to actively filter microscopic food particles directly from the water column. When not filter-feeding, they emerge from the sand to bulldoze slowly across the bottom, acting as heavy-duty detritivores to vacuum up decaying organic matter.

Coloration & Sexual Dimorphism:

Sexual dimorphism is generally non-existent to the naked eye. Their coloration is the reason for their immense popularity ("White Wizard"). The incredibly thick, smooth, rounded shell is usually a pristine, milky white, cream, or pale ivory, often overlaid with extremely subtle, pale blue or pale green bands (usually algae buildup). In stark contrast, their massive, muscular, fleshy foot is a deeply saturated, dark mottled grey or almost pitch black, often speckled with tiny yellow dots.

Tank Setup:

The aquarium architecture MUST accommodate their size and their unique filter-feeding, burrowing biology. A minimum 40-liter (10-gallon) tank is required. CRITICAL REQUIREMENT: The substrate MUST consist of soft, fine sand (at least 2 inches deep). They will spend half their lives buried. Coarse, jagged gravel will brutally lacerate their soft foot and prevent them from natural burrowing and filter-feeding. They require moderate water flow to bring microscopic food particles to their gills.

Diet & Feeding:

They are unique, heavy-duty filter feeders and detritivores. CRITICAL CLARIFICATION: They absolutely DO NOT eat healthy, living aquarium plants, making them 100% reef-safe for planted tanks. Because they filter-feed, they will slowly starve to death in pristine, heavily filtered, sterile aquariums. Their diet MUST be meticulously supplemented with powdered spirulina (injected directly into the water column), premium sinking omnivore wafers, and blanched vegetables (zucchini, carrots).

Water Quality:

Originating from the warm, muddy rivers of Thailand, they possess an uncompromising biological requirement for WARM, highly alkaline, and HARD water. They cannot survive cold water; they require tropical heat (24-28°C / 75-82°F). They strictly require hard, highly alkaline water (GH 8-20, pH 7.2 - 8.5) rich in dissolved calcium to maintain their incredibly thick, white shells. Exposing them to soft, acidic water (below pH 7.0) is lethal; it will rapidly pit and dissolve their beautiful ivory shells.

Compatibility & Tankmates:

Compatibility is excellent due to their peaceful nature and immensely thick, impenetrable shell and trapdoor. They are the perfect, harmless cleanup crew and filter-feeder for peaceful community tanks and planted setups. They completely ignore fish and dwarf shrimp. However, they MUST NEVER be housed with aggressive, snail-eating predators (massive Loaches, large Cichlids, Pufferfish) that will relentlessly harass them, forcing them to stay sealed in their shells until they starve to death.

Aquarium Breeding:

Breeding the White Wizard Snail is incredibly slow, fascinating, and highly prized. They belong to the Viviparidae family, meaning they are true livebearers (viviparous). Females do not lay eggs; they incubate the embryos internally for months and give birth to fully formed, surprisingly large (up to 0.5 cm) miniature, independent snails. Because they reproduce incredibly slowly (producing only a few babies a year), they will absolutely NEVER overpopulate a tank or become a "pest."

Risks & Diseases:

The absolute greatest physical risk is slow, agonizing death from massive shell degradation (pitting and whitening) caused by keeping them in soft, acidic water lacking calcium; hard, alkaline water is unconditionally mandatory. The second major risk is lethal starvation; owners often fail to realize they are filter feeders and place them in sterile, over-filtered tanks without providing powdered food supplements. Finally, keeping them on sharp gravel will cause severe, lethal foot lacerations.