Take advantage of this bulk pricing where we will select from our available inventory. You will receive one of the following: Red Graciliaria, Chaeto, Sea Lettuce, Grape Caulerpa, or other based on availability. Macro Algae is a great addition to refugiums or aquariums to feed herbivores and copepods. Macro Algae can bear hypersalinity treatments in quarantine.. Macro Algae is a favorite appetite stimulant for most of the herbivorous animals. Macro Algae proves fantastic for refugiums and prefers to live in nutrient-rich water. If the water is not rich in nutrient levels, then you can make use of iron supplements, which will help in the proper growth and survival of the Macro Algae. But, precautions are mandatory while handling iron supplements in water.