It would be overcrowded but that would be the point. I've run accross many cichlid keepers that keep A LOT of fish in their tank to prevent aggression issues. By overcrowding the tank you are making it harder for a fish to pick another one out of the crowd to fight. The person I bought most of my fish from had about 75 africans in a 150 gallon and it looked incredible. I havnt had any trouble trying to do the same thing in my 55, there may be some short chases but they get distracted by the other fish right away. As long as nitrates are checked regularly and frequent water changes are done it works out great.