Sulawesi Cardinal Shrimp (Caridina dennerli)

Taxonomy and Appearance

Caridina dennerli belongs to the Atyidae family. It is easily identified by its intense, velvety red body covered in small, bright white spots and stripes. Their walking legs are often white, and they possess delicate, fan-like structures used for filter-feeding and grazing on surfaces.

Habitat Requirements

These shrimp are endemic to Lake Matano, where they inhabit rocky substrates. In an aquarium, it is essential to replicate these conditions with plenty of porous rocks and minimal substrate. The water must be clean, highly oxygenated, and maintained at higher temperatures compared to most other freshwater shrimp species.

Feeding

In the wild, they graze on biofilms and algae covering rocks. In captivity, they should be provided with high-quality, specialized shrimp foods that encourage biofilm growth. Supplemental feeding should be done sparingly to maintain high water quality, as they are sensitive to nitrogenous waste.

Tank Mates and Behavior

Due to their specific environmental needs and shy nature, they are best kept in a species-only tank. If tank mates are desired, only very peaceful, small snails from the same lake system are recommended. Avoid any fish or aggressive invertebrates that may stress or outcompete them for food.

Molting and Breeding

Molting is a critical period where the shrimp sheds its exoskeleton to grow. Providing stable mineral levels is vital for successful molting. Breeding happens in freshwater without a larval stage; females carry relatively large eggs that hatch into fully formed, miniature versions of the adults. The survival of offspring depends heavily on the presence of mature biofilm in the aquarium.