tank space in my opnion is relative. Its like people who live as nomads, roaming the fields, compared to some city slickers, that live in a 700 sq. ft. apartment and has never been out of the State, which one is happier.
Or how about compare the homelss that roam the city, free range, but scavange for food, then our inmates, that are confined to 10x10 give or take, but have food, shelter, and basic necessities met, who has a better life?
Survival is the key, who wouldn't want a 10,000 square feet mansion? well, the rich people with it aren't necessarily happier than the guy in the 600 square feet apartment.
The pacu spawned, probably got a big water change, and thought the the drought had finally ended, and it was time to make babies. In the amazon during the dry season, many of them end up dried up in little mud pool, and become breeding grounds for maggots, so even people say they should roam free in the river, unrestricted, but is their life actually better? In this smaller tank, they're fed, and free from predators! Thought for the day
even people in piss poor countries, scanvanging for food, still make babies. its real strange, but according to a. maslow, if our basic needs aren't met, we cannot achieve the next level, so for the pacu what is their heirarchy of needs? maybe reproducing is their ultimate accomplishment without self actualization. sex believe it or not, is a very essential need on the heirarchy of needs!