Altoflavus come from a few hours north west of where I live now, a warm wet area (Bocas del Toro in the Chiriqui area).
I would treat them as I would any Amatitlania from the area (of which they are many).
Water temps near 80, moderate to considerable flow, a general pellet for omnivires with Spirulina.
Although I have not kept altoflavus I have kept its closest cousins, nanoluteus, mynae, and panamius. All did well and spawned in tanks as small as 75 gals, no other cichlids (unless in a grow out situation), but with appropriate dithers such live bearers or tetras.
Myrnae
panamius
nanoluteus
Since they are so closely related, I would not mix Amatitlania species in the same tank.