Crystal Red Shrimp (CRS)
Caridina logemanni
The iconic Crystal Red Shrimp features striking red and opaque white bands. It thrives in cool, highly oxygenated, acidic water with active soil substrates.
Température de l’eau
20 - 24 °C
Valeur du pH
5.5 - 6.5
Type d'eau
Eau douce
Type d'invertébré
Freshwater shrimp
Taille adulte
3 cm
Groupe minimal
>= 10
GH
3 - 5 dGH
KH
0 - 1 dKH
TDS
90 - 130 ppm
Rôle écologique
Scavenger
Sensibilité au cuivre
High
Description de l'espèce
Geographical Origin and Habitat: Caridina logemanni is natively found in small, shaded, cool mountain streams in Southern China. These biotopes feature highly oxygenated, very soft, and slightly acidic waters flowing over rock substrates covered with decaying leaves from the surrounding forest canopy.
Taxonomy: Belonging to the family Atyidae, this species was formally described to distinguish the Crystal Red/Black lineage from other cantonensis-like shrimp. They reach 2.5-3 cm in size. Morphologically adapted for continuous grazing with specialized mouthparts designed to brush biofilm off surfaces.
Social Behavior: Entirely peaceful, non-aggressive, and highly social. They spend their time foraging on the substrate and botanicals. Keeping them in large colonies (10-15 individuals minimum) is essential to reduce stress, encourage active foraging, and promote natural behaviors.
Coloration and Sexual Dimorphism: Features alternating bands of bright red and opaque white. The shrimp are graded (A to SSS) based on color coverage and density. Sexual dimorphism is visible in adults: males are smaller and slimmer, while mature females are larger with broader abdominal plates to shelter eggs.
Soins, reproduction et cohabitation
Tank Setup: A tank of at least 20-30 liters is recommended. An active buffering soil (aquasoil) is highly recommended to stabilize pH on the acidic side. Provide driftwoods, mineral stones, and dense mosses which act as ideal shelter during the vulnerable post-molt phase.
Diet and Feeding: Feed mainly on bacterial biofilm, micro-algae, and organic debris. Supplement with specialized plant-based shrimp pellets, spirulina, dried nettle leaves, and natural leaf litter (catappa/oak). Do not overfeed to keep organic waste levels at a minimum.
Water Quality: Requires stable parameters: temperature 20-23°C (cool water is essential), pH 6.0-6.8, GH 4-6, KH 0-1, and TDS 120-150 ppm. Remineralized Reverse Osmosis (RO) water is highly recommended. Highly sensitive to copper, chlorine, and chemical treatments.
Compatibility and Tankmates: A species-only tank is highly recommended for breeding. If necessary, they can be housed with small, peaceful snails and micro-rasboras (e.g. Boraras). Avoid bottom-dwelling fish or any species large enough to view the shrimp as prey.
Aquarium Breeding: Breeding is achievable in stable water. The female carries 20-30 eggs under her abdomen for 4 weeks. Direct development means they hatch as miniature versions of the adults, requiring mature biofilm and powdered baby foods to survive.
Risks and Diseases: High temperatures (exceeding 24-25°C) reduce dissolved oxygen and increase mortality. Vulnerable to fatal molting failures from osmotic shifts (sudden TDS changes). Prone to opportunistic bacterial infections under poor tank hygiene.
Origine et répartition géographiques
Caridina logemanni is natively found in small, shaded, cool mountain streams in Southern China. These biotopes feature highly oxygenated, very soft, and slightly acidic waters flowing over rock substrates covered with decaying leaves from the surrounding forest canopy.
Origine
Sélection et cultivarsAsie de l'EstOcéans tropicaux et récifs
Profil d'invertébré
- Régime alimentaire
- Omnivore
- The dietary requirements for Caridina logemanni revolve heavily around their constant grazing on biofilm and algae. In a mature aquarium, they will naturally find a significant portion of their food by foraging across surfaces. However, it is important to supplement their diet with high-quality commercial foods designed specifically for them. Vegetable matter, blanched spinach, or specialized sinking pellets can ensure they receive full nutrition. Providing a varied and balanced diet directly correlates to better coloration, growth rates, and overall vitality.
- Rôle écologique
- Scavenger
- In their natural habitat, Caridina logemanni plays a vital ecological role as part of the clean-up crew. They help maintain the balance of their ecosystem by breaking down decaying organic matter and consuming nuisance algae. This natural behavior translates perfectly into the home aquarium, where they serve as tireless workers keeping the environment pristine. By reducing the buildup of detritus, they indirectly improve water quality and prevent the spread of harmful pathogens. Their constant activity makes them a functional and invaluable addition to any balanced aquatic system.
- Taille adulte
- 3 cm
- Risque de saut
- Yes
- Aquarists should be aware that Caridina logemanni has a known tendency for jumping out when startled. This usually happens if water parameters deteriorate, prompting an instinctual escape response to find better conditions. A tight-fitting lid or a custom mesh screen on the aquarium is highly recommended to prevent any dry tragedies. Keeping the water level an inch or two below the rim can also deter escape attempts effectively. If an individual is found outside the tank, returning it quickly to the water might still save it if it hasn't completely dried out.
- Sensibilité aux chocs
- Extreme
- It is widely documented that Caridina logemanni is incredibly susceptible to osmotic shock and rapid shifts in water parameters. When introducing them to a new tank, a slow drip acclimation process over several hours is strictly necessary. Sudden fluctuations in temperature, pH, or dissolved solids can lead to immediate stress, failed molts, or death. Aquarists must ensure that top-offs are done slowly and with matched water to maintain stability. Routine water changes should be smaller and more frequent rather than large, sudden replacements.
- Calcium et minéraux
- High
- Adequate calcium levels are fundamentally important for the survival and growth of Caridina logemanni. Calcium is the primary building block for their exoskeleton or shell, and a deficiency can lead to fatal structural issues. The water column must have a balanced general hardness (GH) to provide dissolved minerals for absorption. Additionally, offering calcium-enriched foods or specialized mineral supplements can greatly assist their biological needs. Regular testing of the water's mineral content is recommended to ensure they have enough raw materials to thrive.
- Mue
- Yes
- The molting process is the most vulnerable time in the life cycle of Caridina logemanni. During this period, they shed their old exoskeleton to grow, leaving them soft and defenseless for a short window. It is crucial to provide ample hiding spaces, such as dense moss, tubes, or leaf litter, so they can retreat safely. Never remove the discarded molts from the tank, as the invertebrates will consume them to quickly reclaim lost calcium and minerals. A failed molt, often seen as the "ring of death," is typically indicative of mineral imbalances or stress in the aquarium.
- Reproduction
- Rare / not documented
- Breeding Caridina logemanni in captivity can be an immensely rewarding experience for dedicated aquarists. Some species breed readily in stable parameters, while others require complex larval transitions through brackish water. Once conditions are optimal, females will generally carry the developing eggs until they hatch. Ensuring a predator-free environment and abundant microscopic food sources, like biofilm or specific larval foods, is essential for high survival rates. Observing the successive generations grow adds a dynamic and fascinating layer to keeping them.
- Compatibilité et compagnons
- Species only
- When selecting tank mates for Caridina logemanni, extreme caution must be exercised to prevent them from becoming an expensive snack. They should ideally be kept in a species-only tank, or alongside very small, peaceful nano fish that pose no threat. Any fish with a mouth large enough to swallow them will likely try to do so eventually. Bottom-dwelling competitors or overly aggressive feeders might also outcompete them for resources. A thoughtfully planned community prioritizing peaceful coexistence is the key to their long-term thriving.
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