fish keeping

I saw a pirate perch for sale somewhere. It is a small predator fish. It gets about 5 inches and I don’t really know how to keep one so if anyone knows anything about keeping them tell me

I have a 1000 Gallon aquarium that I was wanting to stock with Peacock Bass, but I am not able to get them in my area for anything that isn't absurdly expensive. I already have a 7" Silver Arowana enjoying itself in the aquarium, so I'm looking for something that can be compatible with Silver...