I've heard many times that cubed hay and loose hay require different grinding actions of the teeth. The loose hay is more beneficial for keeping the back teeth or molars ground down to an appropriate level. If the chinchilla likes the cubed hay, you can give it to them, but I would continue to offer the loose hay as well.
Also, be careful with alfalfa. If your pellet is alfalfa based and you're also feeding alfalfa hay, your chinchilla may be getting too much calcium and this can lead to bladder stones.
Last edited by Legend8201; 04-19-2008 at 02:21 PM.