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Â· Tropical Fish Food. Costia Costia is one of the many fish diseases that are caused by protozoa. It is a somewhat rare disease that is relatively easy to cure if your fish becomes infected by it.ronema marinum-Information on diagnosing and treating Uronema marinum. Velvet-Information on diagnosing and treating velvet. Costia is one of the many fish diseases that are caused by protozoa. It is a somewhat rare disease that is relatively easy to cure if your fish becomes infected by it.
1 Keep in mind that scaleless fish cannot tolerate much, if any, salt. 2  Parasites-Many parasites can be effectively treated with the use of salt, particularly Costia infestations. 3  Live plants-If you live plants in your aquarium, avoid using salt. Plants can be damaged with a relatively low dosage of salt, which is one reason it's best to treat sick fish in a hospital tank rather than your regular tank. 2  Scaleless fish-Scaleless fish, particularly Cordydoras, are very sensitive to salt.