My Tank is 66 Gallons (250L.), the Aequidens Pulcher are pretty small (the male is about 3 inch). The Pair Metae would be from a private person, the metae male is about 5-6 inch)
The pulcher pair has acted peacefully against any other tankmates so far, even when breeding, the owner of the metae pair sais the same about them, but neither has been kept along with other cichlids.