Macro Algae definitely!!! You pod population will love these, and your horses will love the pod snacks.
LR does help with the pod population, but after the disater with Valiant and my pony tank, I bleached all my LS and live rock. They only live things I place into my tanks for now, are food, mini star fish, pods, and macro algae. Each I give a fresh water dip to before placing in the tanks. Introducing LR and LS can also invite many unwanted and devistating pests.