I want to establish some sort of macro algae in my display tank that a kole tang will eventually want to graze on. I will also have a refugium with chaetomorpha, ulva, gracilaria, and possibly some type of caulerpa. I will use these to supplement the tangs diet, but I thought it would be neat if there was another type of macro in the tank all the time for the fish to pick at. The chaetomorpha, and gracilaria both are not anchored, so those won't work. The Ulva I have no experience with, and the Caulerpa is apparently not always appetizing to tangs. Is there another choice I should consider? Thanks.