i am not sure , but I think this is the wrong species. I don't think it is Fundulopanchax gardneri
i think it is Fundulopanchax sjostedti
but i could be wrong, because i am kinda stupid, my source is wikipedia do
This is indeed Fundulopanchax sjostedti, the Blue aphyosemion. I based the name on ZTL's name for the species, since I couldn't find a real agreed-upon name for the species.
The F. gardneri is reffered to as the Blue lyretail on ZTL