[nicolaas]

I think it might be the salt as tetras are sensitive to salt.
But I had flame tetras myself and the same thing happened to me, fine one day and dead the next.
Feed them high protein food,as they are micro predators.

Try to do a big water change and don't ad salt.





Nicolaas.

 

[nicolaas]

I got 7 and 4 died, the other 3 were very sick and so I fed them to my dragon.

Remember in the future not to use salt on Tetras.