[roxstar]

I think it is fine, but if you can't get both (29fish and twentyninefish) you might want to consider the latter.

It is more likely though that a person would type 29 over twentynine just over the shear size of the word, same goes for things like 103 and such, but thirty could easily be typed.

Sorry if that came off rambly but the size of the number typed will matter and you most definitily don't want something like 2fish.com if you can't get twofish.com but 103fish.com if you can't get it spelled out would be fine it is going to depend on the size of number word typed.