Thai Micro Crab (Limnopilos naiyanetri) is one of the smallest and most remarkable invertebrates in the freshwater hobby — a fully aquatic crab found in only one place on Earth, a single river system in Thailand. At just 5mm across the carapace, with a leg span reaching about an inch, this delicate, semi-translucent crab resembles a tiny spider as it clings to plants, moss, and driftwood. Unlike the vast majority of crabs, the Thai Micro Crab never needs to leave the water — it lives, feeds, molts, and goes about its entire life fully submerged, making it a true nano aquarium and planted tank resident rather than a paludarium animal.
Thai Micro Crabs are extremely peaceful and entirely safe with dwarf shrimp — they pose no threat to Neocaridina, Caridina, or any other small tankmate, and make an excellent addition to a mature, densely planted shrimp tank. Dense plant growth, mosses, and fine root systems are not just decoration for this species — they are essential structure that the crab anchors to while filter feeding, and a tank without enough of this kind of cover will leave the crab without anywhere to successfully feed. Like the Bamboo and Vampire Shrimp, they do best in established, mature aquariums with adequate suspended organic particulate, and they pair extremely well with both of those species since all three share the same flow and feeding requirements.
These crabs are tiny, shy, and easy to overlook in a busy planted tank — patience is rewarded, as they will become more visible once settled into a secure, well-planted environment. Keep ammonia and nitrite at zero, as this species is sensitive to water quality, and avoid keeping them with any fish large enough to see them as a snack.
| Thai Micro Crab | |
|---|---|
| Difficulty | Intermediate — specific flow and feeding needs |
| Temperament | Peaceful — safe with dwarf shrimp and other small tankmates |
| Adult Size | About 5mm carapace width; leg span up to 1 inch |
| Group Size | 3+ recommended — does best in small groups |
| Recommended Stocking | Suitable for nano tanks 5 gallons and up |
| Ideal Temperature | 72–82°F (22–28°C) |
| Ideal pH | 6.5–7.3 |
| Diet | Filter feeder — suspended micro-particles only, not substrate foods |
| Staple Food | GlasGarten Bacter AE; GlasGarten Shrimp Baby Food (dosed near flow) |
| Origin | Thailand — endemic to a single river system |
| Notes |
Copper: Fatal — never use copper medications in this tank Fully Aquatic: Unlike most crabs, never needs to leave the water — no land area required Flow: Requires gentle current directed at its perch to filter feed successfully Planting: Dense plants/moss are essential structure, not just decoration Tank Maturity: Needs an established, mature aquarium with adequate suspended particulate Tankmates: Pairs well with Bamboo Shrimp and Vampire Shrimp (same flow/feeding needs); safe with dwarf shrimp |
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