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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.
Goldfish and Costia. Of all of the parasitic infections that can affect goldfish, costia is one of the very smallest and hardest to identify. Costia can only be seen under a microscope, and even then, it can be hard to positively identify.f all of the parasitic infections that can affect goldfish, costia is one of the very smallest and hardest to identify.