Killifish species profile:
Maratecoara formosa

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AKA the World's smallest livebearer. Great nano fish for desktop aquariums and betta setups. Also makes an excellent tiny feeder fish
... view on ebay

Least Killifish (Heterandria formosa)
You will receive 10 juvenile, unsexed Least Killifish (Heterandria formosa), tank raised in Ohio, USA
Least Killifish are one of the smallest livebearing fish in the world and are prized for their peaceful nature, fascinating behavior, and ease of care. Despite their name, they are not true killifish, but a livebearing species native to the southeastern United States
They thrive in planted aquariums and are an excellent choice for nano tanks, ... view on ebay