...some sort of parasite perhaps?

I'm far from an expert but that's the vibe it gives me.

 

...some sort of parasite perhaps?

I'm far from an expert but that's the vibe it gives me.

Perhaps, but I am unable to find any parasite that looks like my pictures. So I am a bit hesitant to just try parasite medication. But I might have to if things get worse.
I also find it very strange that the parasite (or any disease really) would only target the rummy nose tetras.

 

Yeah it’s hard to find clear evidence, what I found is a few scattered forum discussions where general consensus was that white smooth lumps could be parasites and a few cases where parasite treatment seemed to help... but it’s not super clear at all. Smooth lumps can also be tumors but those wouldn’t be contagious.

I’ve read that a good initial attempt at getting rid of almost any parasite is a slightly higher temperature and an aquarium salt bath. In a spare hospital tank/ dish since the fish should only stay in the salt solution a short while I think? It’s better than dosing the whole tank with meds and shouldn’t hurt them at any rate.

I doubt it’s targeting only the rummynoses in general. But in every tank I guess there’s gonna be a species that is the most sensitive, least adapted to water parameters, and thus most susceptible to whatever attacks the tank... and rummynoses don’t really practice social distancing so they can spread it to each other sooner than to other fish who don’t school with them? Just conjecture of course, I’m no fish doctor. All I’m saying comes from reading about other people’s situations, NOT from personal experience.

 

Hi Surskittles and Lidija,

I have community tank as well with rummy nose tetras, glowlight tetras, harlequin rasboras, platies and 1 betta. My rummy nose tetras have the same issue as described above for more than 5 months now. Only 1 fish died out of 9 so far (the fish died had a genetical disorder with a tail that wasn't grown probably, so maybe it might be a bit weaker than the rest). This parasite (most probably) doesn't grow on other fish species I have. One thing I observed, they're hiding at the back of the tank under the plants. Before this parasite they were all around, now I only see them when I feed the fish.

I tried high temperature (30 C) treatment but it didn't help and it wasn't good on my platies so I stopped it. My tank is very densely planted, so I didn't tried salt treatment.

Please let me know, if you learnt some other way to treat them? I don't want to make my fish suffer.

Thanks,

Chara