Re: Ember Tetra internal "growth"?
This looks like a nematode worm parasite.
You probably have lost or euthanized these few infected specimens by now. Big parasite in a small Tetra species =death. Treatment is useless for such advanced cases.
I used to raise Ember Tetras by the hundreds just so I could set up a mass display cheaply.
Very nice species.
Old fish breeder. SA Dwarf Cichlids, Hypancistrus sp L260, L333 and Peckoltia L134 breeder. Also Sturisoma, Dwarf Corydoras spp, wild Discus and Killiefish. Like breeding Characins and wild Betta spp too.
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