The threadfin dwarf cichlid likely comprises several different species, and this particular species name seems to be used as a catch-all for several exported Apistos, particularly those with longer fins. As such, it is important to purchase these fish from a single seller, at once, rather than risk mixing multiple species. In their natural habitat, like most Apistogramma , these fish come from soft, relatively acidic water, and these conditions may be required for successful spawning. Successful spawning of Apistogramma iniridae may require a pH below 5.0.
Threadfins are reasonably peaceful fish, though they are territorial and will protect their favourite coconut shell, cave, or other structure. The males can be aggressive toward each other, especially during spawning. It is not unusual for a younger, 'subdominant' male to take on the colouration and apperance of a female to avoid aggression from the dominant male -- which can be frustrating for those who think they have a pair! These fish spawn best in harems, with a single male and multiple females.
These fish mix well with other small, peaceful fish, such as Glowlight Danios, Hatchetfish, Pencilfish, and Pseudomugil spp. rainbowfishes.