Gold Tetra

The gold tetra is known for the metallic gold sheen that covers the body of wild-caught fish. Interestingly, this color comes from a defensive reaction against parasitic (trematode) larvae that settle in the fish's skin: the skin accumulates a shiny substance called guanine. For this reason, fish bred in the aquarium are mostly silvery yellow. The sheen does not harm the fish; the species is generally hardy.

• At least 60 liters for a school of 8–12.
• 24–27°C, pH 6–7.5, soft to moderately hard water.
• A dark substrate and planted background bring out the gold color.
• 25% water change weekly; gentle to moderate flow.

Omnivorous. Alongside flakes and small granules, offer frozen brine shrimp, bloodworms and daphnia. 1–2 meals a day, only as much as is eaten within a few minutes, are enough.

A peaceful and active schooling fish. It does not harm other species; in a large group it swims together in the middle layer. It usually leaves adult shrimp alone but may eat their young.

Good companions: other tetras, rasboras, corydoras, otocinclus, dwarf gouramis, small livebearers.

Avoid: large fish that can fit it in their mouths and aggressive cichlids.