I agree with DB, the armatus is gonna likely outgrow and make a snack of some of the fish mentioned, and cudas aren't gonna be able to hold their own imo or grow fast enough. The bichirs growth can vary so be careful with them outgrowing the atf to much and making a snack of him. The tats and mala should be fine. If you add odoes and you wanna do a group I say do atleast 3, DB knows more about them in a group then I do. But seeing mine alone in my 120 I wouldn't try a group in anything less than a standard 240 personally..