KITTY TETRA (Hyphessobrycon cf. loweae)

Said to be quite a peaceful tetra which mixes well with other fish when kept in a small group. Male Hyphessobrycon display their best colours (and behaviour) when kept in mixed sex groups alongside plenty of females.

https://www.practicalfishkeeping.co.uk/features/kitty-tetra-hyphessobrycon-cf--loweae/