Black Neon Tetra
£1.50
Black neon... Hyphessobrycon herbertaxelrodi
Forever known as black neons, these look nothing of the sort, but never mind.
Care and breeding is much the same. if you want to multiply them, you need softer water and little to no light.
Very peaceful, but do get a little larger than neons. I've seen these at about 1.5 inches and the body is deeper than their namesakes as well.
Get at least 10. They look lost otherwise.