There are a couple possibilities that I can think of...
1: The Neons with big bellies are females carrying eggs. You would need to create a place for them to spawn, preferable a place with live plants that they can scatter their eggs in.
2: They have bloat or Neon Disease (Plistophora). In this case, there isn't much you can do as they are going to die.
I would plan on them spawning and get some live plants for them to scatter their eggs in.
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