PEARL SPOTTED KILLIFISH (Aphanius Mento)

Its particular water requirements and territorial behaviour make A. mento a poor choice for the community aquarium. Given its rarity in the hobby the emphasis should also be on captive reproduction and we strongly recommend maintaining it alone. It should be kept in a group with a ratio of two or three females to each male being the ideal. Males of this species are the most aggressive in the genus and will often fight to the death while unreceptive females may also be killed if the tank is insufficiently decorated. They will also attack other species in a community setting and we have read of several ‘experiments’ that have ended with dead cichlids and suchlike.

https://www.seriouslyfish.com/species/aphanius-mento/