Just going to go ahead and state the obvious, its not a native tank if you have tinfoils and oscars.
If you want tinfoils oscars and a florida gar, there are loads of cool tropicals you could keep with them that would be better and more visually appealing than the natives.
I have tinfoils and a florida gar in my 225 and I love keeping them with my GG clown knife, bichirs and Achara catfish, Keeping a bunch of dull brown coloured fish that require different temperatures just wouldn't compare