Just take Cyatopharynx...O. boops and O. ventralis are highly agressive...
This is also an 6 ft tank...i keep them with C. kitumba and Petrochromis...and O. ventralis only the Boss in the Tank...
This is also an 6 ft tank...i keep them with C. kitumba and Petrochromis...and O. ventralis only the Boss in the Tank...