What is NTD?
Neon Tetra Disease is caused by Pleistophora hyphessobryconis, a parasitic spore that destroys muscle tissue from the inside out.
Despite the name, it affects multiple tetra species and even unrelated fish (angelfish, danios). Once symptoms show, the fish dies within weeks.
Symptoms
Loss of color (especially the iridescent blue/red stripe).
Cysts or pale patches under the skin.
Spinal curvature, swimming difficulty.
Isolation from school, refusal to eat.
Cannot be cured. The infected fish should be removed immediately.
- ✦Look at the lateral line stripe daily — fading is the first sign.
- ✦Quarantine new neons for 30 days.
How It Spreads
Other fish eat infected dead bodies and contract the parasite. This is how outbreaks happen — one dies, others scavenge, three more die.
Remove dead or sick fish immediately. Do not feed live tubifex worms (sometimes carry the parasite).
Prevention
Quarantine all new tetras for 4 weeks before adding to the main tank. Buy from a reputable source — pet store neons are notoriously infected.
Maintain pristine water. Stressed neons succumb faster.
False NTD
Some bacterial infections look similar to early NTD. If you catch the fish early and it responds to antibiotics (Furan-2, Maracyn), it was a treatable bacterial issue, not NTD.
Try antibiotic treatment first if uncertain. Real NTD does not respond to anything.