This will give you an idea of how big that pacu can get in my opinion you would need at least 250 gallons tank for that fish and you will need an extremely efficient filtration system. The life span of these fish can be 5 - 15 years please think about it. Good on you if you decide to stick with him but you could have a lot of cool fish in a set up that big. I am building a tropical pond and the thought that goes into it is not that simple. You need to run large heaters and filtration and I have had to by a dehumidifier as well to stop the condensation rotting the timbers in my fish room. Running it as well is not cheap another consideration to take on.
