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Not to be a downer but the general consensus, at least on this site, is that pacu require an enormous enclosure to live out their lives in. I do admire your desire to upgrade the living situation, but most of the "successful" pacu keepers ive seen keep them in ponds or tanks of several thousand gallons. These are massive fish once they reach maturity and are actually capable of destroying all but the sturdiest 200 gallon tanks from the inside out when they put on some size.
thebiggerthebetter
tanks as well as
pacu mom
to give you some idea. 
You should probably go for something closer to 72"x36"x24" or around 300 gallons as 200 gallons will be a bit of a tight fit as they can hit 24 inches. But it's great that you will be able to keep him for a lot longer, possibly life if he stays within the 12-18 inch range.
Just try to get a bigger tank when you can, if you can't, no big deal unless he breaks 16-18 inches, in which you should upgrade, I would recommend atleast 72"x36"24" as the fish has enough room to swim and turn around fine. Or better yet, get an indoor pond of 1,000 plus gallons and he'll have a blast.
i sense true love....enjoy your fish
I had the same problem when I first got into the hobby. They are still one of my favorite fish I have kept, very personable. I hope to able to create a suitable environment so one I can keep them again one day.
24" is a conservative estimate for captive specimens. Properly cared for redbelly pacus can grow much larger. I suspect the 24" max size you often see quoted is due to the overwhelming majority of these fish being kept in cramped conditions.
The store is probably really slow because people don’t appreciate the cruelty to animals and mistreatment. Wow this guy tortured a big fish for 40 years, let’s all go get one. It’s ok just give it more goldfish.
