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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.
Many cichlids, particularly tilapia, are important food fishes, while others are valued game fish (e.g. Cichla species). The family also includes many familiar aquarium fish, including the angelfish, oscars, and discus. Cichlids have the largest number of endangered species among vertebrate families.