Swallowtails are peaceful to a mildly aggressive variant of the Otter Point peacock. They have a similar color to Aulonocara Eureka Red. Males develop white extensions on the end of their dorsal fin, front lower fins, and tail around 5+". They also tend to show more white on their dorsal fin, and the end of their tail than most Eureka Red. Females are cream with brown stripes. These fish are part of the Jacobfreibergi group; but, are less aggressive than other peacocks in that group.

This fish is very attractive when it gets in full extensions. It should not be overlooked. 

The photo is of one of my wholesaler's younger breeder males.