Rosy Barb (Neon)

Rosy Barb... Pethia conchonius.

These are a favourite of mine. Pretty much bomb proof so long as your water contains enough dissolved oxygen, rosys don't mind cooler water and fall very definitely into the 'temperate' zone of fishkeeping. Exact water parameters are not critical, but avoid extremes.

These ones and Neon Rosy barbs, and they differ from the wild fish by having a more uniform colour. Males turn red when mature, whereas females are a more golden colour. 

They never stop swimming, are the first up for food and are just generally a brilliant fish to keep. I'd go for a decent shoal, like at least 6 but preferably more. This does mean they need to be in a reasonably sized tank, maybe 100 litre or more.

A fish you can probably breed in a bucket, they are egg scatterers with a taste for their own eggs and fry. So long as you get the parents out quickly after spawning, the fry are easy to raise.

A quick note from my personal experience, although peaceful, rosys seem to like mowing the dorsal fins or corydoras catfish. They dont do anything else... you just end up with corys that look like they were attacked by a bad barber.

I've never encountered any other issues with these, so I assume its just down to their exhuberant lifestyle.

Honestly though, if its movement and colour that you want, you can't look past these.