Reef Nutrition by Reed Mariculture TDO Chroma BOOST food is granulated and pelletized then "top dressed" with Haematococcus AIgae providing an excellent source of astaxanthin leading to healthy animals that are able to show off their vibrant colors. Used by many marine breeders, TDO Chroma BOOST comes in many different sizes and can give you the best chance to raise fish larvae into full grown adults