When I bought my Protomelas lithobates, I also discovered this species. Initially, I was told it was an Otopharynx heterodon, but I later learned it is actually Trematocranus placodon. I couldn't resist adding it to my collection; the males turn completely blue with yellow sections that are truly striking. This is my second male, as the first one unfortunately died during a move.
Behavior and Diet
In the wild, Trematocranus placodon is a specialist. It is equipped with very powerful pharyngeal bones used to crush snail shells. In the tanks where I have kept it, I have absolutely no snails; or at least, they don't last very long once this fish is introduced. It is a relatively large cichlid, reaching lengths of 20-25 cm, which necessitates ample swimming space.
Breeding and Temperament
My pair has successfully spawned. The female is a typical mouthbrooder, but she can be incredibly nervous during the brooding period. I've noticed that she can panic if I disturb the tank during maintenance or water changes, so I am always extra careful when she is carrying fry. The female grows nearly as large as the male but retains her spotted pattern and silvery sheen.
Aquarium Requirements
Due to its size, it should be kept in a tank of at least 300 liters. It thrives best in a standard Malawi environment with a sandy substrate and rock formations. Water parameters should remain stable with a $pH$ between 7.5 and 8.5 and a temperature of 24-26°C.
