Your making your life very hard from the start mate, to many big fish in a small tank.
You are way over stocked already, pacu need 1000g plus, peacock bass are for tanks over 300g ideally, what gar is it alligator?
You need to do some research on the fish before you buy them.
Got any pics of the tank and stock?
Glad the new fish are OK atm but personally I would get the stock down to fish that can live their life out in your tank.
Unless you have some plans for a monster tank that is and money isn't an issue of course.