These look most similar to the platinum blue variant of the species. They have that shiny appearance but these will come in different colors.
It seems the “fancier” the variation of the breed like this one the more peaceful they are, but they can still be predatory and may nip at other tank mates especially if they don’t have enough room or are laying eggs.
Keep décor such as driftwood and plants in your tank if housing these beauties. Like with other fish, keep your water quality maintained for the health of these fish.
Feed them a varied diet such as flakes, small pellets/granules, or bloodworms.