there are three species of tetra that have neon in their common name
the "standard" neon tetra Paracheirodon innesi
the green neon tetra aka false neon tetra Paracheirodon simulans
and the black neon tetra Hyphessobrycon herbertaxelrodi
The "std" neon is available in a few colour morphs
Diamond head neon tetra, gold[en] neon tetra, albino neon tetra & lutino neon tetra.
The only neon tetra I do not own is an albino form.
Bettas
Green neons are very sensative, more so than "std" neons, to water conditions.
they often die at any sign of nitrIte, so a good housekeeping regiment is needed to
keep these happy and healthy.
HTH