Neon Tetra Disease or something else?

Had something very similar in my neons. Had a school of 6, 3 of which developed what you are seeing. They also had a tendency to not school and to hide in a secluded area. Eventually took the precaution to euthanize and the other three never showed the symptoms.

Water conditions?

Do they appear to lost some locomotive ability compared to rest of neons?

Vid posible?

I've never had a case of NTD, so I can't say from my own experience how these pictures compare with that, but, to me, and correct me if I'm wrong, the photos seem to show lesions that are slighty fuzzy, fluffy, or filmy - maybe like wet cotton.

The areas don't appear to me to be the hairy, whispy strands as in fungus, but more like either excessive slime coat and mucous-y looking, or else like the filmy, fluffy lesions characteristic of Columnaris.

Here are some photos for comparison:

The first two are Columnaris, a bacterial infection, and the second two are true fungus.


This Betta has Columnaris. Note the filmy, fluffy, lesions.


Columnaris can appear as in the above picture, but also as flat dull patches on the body. You can see how the lesion here has a filminess, a wet cottony appearance.



This is true fungus. Note the long whispy, hairy structure of fungal lesions.
Note how this looks more like what appears on moldy bread, or like a piece of food that accidentally was left in the aquarium.


Lucy, one of our AC member's Gourami that developed true fungus. Again, note the long, hairy whisps.


How do these photos compare to what you are seeing? I hope these help.
Get back to us ASAP with your input, please.

How about pH?
NTD will display paleness on the dorsal area first and they do loose locomotive ability (lose of posterior muscle control?), separate itself from rest and eventually hanging in angle at the top before death..

Although pics are blurRRRR, it seems like a possible bact/fungal infection into the tissues.

Hope all goes well

I have seen this before. Cardinals and Neons tend to get stressed very easily. They are difficult to acclimate into a new tank and must be done very slowly. It looks to me like ulcerations from stress. This could be from them being new (I believe you said 2 weeks) or a significant change in water conditions (pH). It could be a fungus but my bet is ulcerations from stress! There is medication for it but it looks fairly advanced...