Neon Tetras in two separate schools

pof562

Hi, I have a 10 gallon freshwater aquarium. I originally had 6 Neon Tetras, a red cherry shrimp, a Japonica Shrimp, Java Fern, and an Amazon Sword. Yesterday, I had a Neon Tetra on the verge of death, struggling to stay horizontal, had trouble swimming (kept getting stuck to the filter intake). Fearing Neon Tetra Disease, I euthanized the fish. Now my 5 remaining Neon Tetras swim in two distinct groups/shoals. Two of them stay in the front left corner of the tank while the other three stay in the front right corner of the tank. If it is NTD I am faced with, how can I identify the sick group? As far as I can tell, there aren't any physical signs of NTD at the moment in either group. Both groups also seem to act normal. No erratic swimming or anything I can identify as a sympton of NTD. Please help.

pof562

Tess2013

Sorry you lost one of your Tetras. Maybe you could add something else to your tank like driftwood or rocks, my tetras are very inquisitive and come together to investigate new things in their environment and hiding nooks so they feel secure. I wouldn't worry if they have split into two groups maybe its a territorial thing.