yes zodiacs! I was looking at those in the petshop today, they look rather like Kuhlis, only not as wriggly, but with Kuhli loaches their might not be enough room for the zodiacs.
I think tigers should be ok, because they would be on the top and middle levels of the tank and the kuhlis would stay on the bottom, but I don't know, they might cause trouble but are very pretty.