Cheers. The Killies are a race of Aphyosemion bivittatum from West Africa. They live in the upper reaches of a the rivers in Africa inhabited by various Pelvicachromis spp. (among others). There's loads more info on these, and every other West African killi on Tim Addis's site. Click on the Genera index for a list of the genera. Here's the page for Aphyosemion bivittatum. They like a quieter than average tank and are ace jumpers so definitely not for uncovered tanks!