TinFoils are laid back (I used to use them as dithers), and *might* be okay dependent upon the size of your tigers. IF they fit in the tinfoils mouth though, they're goners.
Tinfoil barks are VORACIOUS eaters. They have always out-competed(for food) and outgrown (speed wise)every CA/SA I've ever put them with, so I finally stopped buying them years ago.