Yes, you can, but do keep in mind that some killifish may be more territorial than others. Do try to read up on them first as there are many different killifish with different requirements.
Please note that there are annual and non annual killies. As the term implies, annual killies have very short life spans (approximately a year), including
Nothobranchius spp., which is another reason to read up on them first before purchasing rather than lamenting about their short life thereafter.
Good information can be obtained from the local killifish website,
http://www.killies.com, or lookup the database in the British Killifish Association,
http://www.bka.org.uk/index.php
Here is some information on
Nothobranchius rachovii from BKA to start you off,
http://www.bka.org.uk/BKA/SpeciesDetails.php?ID=476
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