With your choice of those two fish, particularly the rabbit, you have little options.
You can defer their eating habits by adding them to a tank with fast growing Feather Caulerpa. If it was a large enough patch, they could maintain it and feed on it at the same time. Be assured, at some point in time, they will munch on your desirable display macro no matter how much other macro is in there.
Variety is the spice of life. Fish want variety just like people.
Patrick