Arc Eye Hawk (Paracirrhitus arcuatus) salt BRS Universal Carbon Blocks are standalone BRS Universal Carbon Blocks are manufactured using high performance catalytic active carbon combined with a new binder system technology which maximizes the availability of the critical catalytic sites Use of MicrōBacter Start XLM does not alleviate the requirement for regular partial water changes to help maintain proper concentrations of elements that are vital to long term health and survival of aquarium inhabitants it is best to introduce this fish as the last addition to the tank community Their meals should comprise a variety of marine meats and live feeder shrimp to meet their nutritional needs and promote their well being in captivity