Malawi size range immensly in size and aggression, so you can't simply generalize a tank size for 'Malawi Cichlids'. A few of them can handle 30 gallons and 3 feet long, the majority need at least 50 gallons and 4 feet long, and many should have 100 gallons or more. If a generalization is going to be made it's safer to do it as 'Malawi's should not be kept in small tanks'.smallest size tank u could have for malawi cichlids