Is this a killifish?

[hongxia]

Appreciated if someone can tell me what fish is this? Thanks.

[bennyc]

This is scarlet badis. They have not color as they have not acclimatize to the new surrounding. They are not killi thou.

[hongxia]

Now I can Google about them.

Thank you Sir.

[stormhawk]

http://www.seriouslyfish.com/species/dario-dario/

This link should get you started. The one you have in the picture is a young male.