Diamond Tetra Identification Guide
Recognize the diamond tetra by its deep, laterally compressed body covered in iridescent, gem-like scales.
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Key identification features
- Deep, rounded, laterally compressed body reaching about 2.4 inches (6 cm)
- Scales flash violet, green, and gold under light, creating a shimmering "diamond dust" sheen
- Large eye with a faint reddish-orange tint along the upper iris
- Mature males grow long, trailing filaments on the dorsal and anal fins
- Fins are mostly translucent to pale yellow with faint dusky edging
- Body profile appears almost circular when viewed from the side, more so than in most tetra species
Common look-alikes
- Red-eye tetra: shares a similarly deep body and reddish eye tint but shows a bold black bar on the caudal peduncle that diamond tetras lack.
- Glowlight tetra: much smaller and slimmer, marked with a solid horizontal orange-red stripe instead of scattered iridescent flecks.
- Silver dollar (juvenile): rounder and flatter but far larger-bodied at maturity and without the diamond tetra's sparkling scale pattern.
Where you'll see one
Endemic to Lake Valencia and its surrounding tributaries in northern Venezuela, this species inhabits calm, densely vegetated freshwater habitats, typically schooling loosely in open mid-water among plants.
Frequently asked questions
How do I recognize a mature male diamond tetra?
Look for extended, flowing filaments trailing from the dorsal and anal fins, a trait females do not develop.
What separates a diamond tetra from a red-eye tetra?
Check the tail base: red-eye tetras have a distinct black vertical bar there, while diamond tetras show only sparkling, unmarked scales.