Water fluctuations can cause cardinal tetras to become sick. Replace leaf litter every few weeks to prevent waste buildupįloating plants help keep the tank dim and darkĪfter the appropriate tank parameters have been set, ensure the conditions are maintained. Exposure to harsh lighting can cause stress and ruin the fish’s coloration Plants: Add aquatic plants that thrive in dim lighting, such as java moss and cryptocoryneĬardinal tetras prefer blackwater environments, which can be created by scattering dried leaf litter at the top of the tank. Cardinal tetras are accustomed to very soft water in the wild Filter: A filtration system that generates a slow to moderate current can help replicate the waters these fish are used to in the wild Bubbler: Not necessary as cardinal tetras can tolerate water with low oxygen levels Lighting: Cardinal tetras need dim lighting. Cardinal tetras jump out of the tank, particularly when feeling stressed or scared Acidity: Opt for a pH level between 4.6 and 6.2, with 5 being the preferred pH level Water hardness: Hardness of up to 4 dGH. ![]() Incorporate caves and branches to replicate the fish’s natural habitat and provide hiding spots Tank should be spacious, with enough open space for the cardinal tetra to exhibit schooling behavior. An elongated tank shape gives cardinal tetras more space to roam and explore Water temperature: 73–81☏ (23–27☌) Substrate: A dark, sandy substrate with driftwood and roots is ideal and lets the cardinal tetras’ beautiful colors shine Tank setup: A biotope tank setup is ideal. Increase size by around 2 gallons per fish. Cardinal tetras can’t tolerate poor water conditions Tank size: 20 gallons for a small school of six cardinal tetras. Ideal tank conditions for cardinal tetras include the following: Water type: Freshwater, partial water changes weekly (25%). Don’t add cardinal tetras to newly cycled tanks. Replicate the cardinal tetra’s preferred living environment with leaf litter, dim lighting, and soft water. The water is stained from tannins, and dense rainforests keep the area shaded and dim. ![]() ![]() In the wild, the cardinal tetra inhabits blackwater creeks with a substrate of branches, roots, and leaf litter. Advertisements Habitat and Tank Requirements
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