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Costia:
Costia is a somewhat rare disease that is relatively easy to cure if your fish becomes infected. There are several treatments for this disease however two of the treatments have serious side effects. Costia causes the skin of the infected fish to become cloudy and milky. The first treatment is to raise the water temperature to 80-83 degrees. This treatment is not a 100% guarantee but it does not present any side effects to fish. The second method for treating Costia is by adding copper at a rate of 2 mg per liter of water. Caution needs to be used when using this treatment because overdosing can cause copper poisoning. Some species of fish are extremely sensitive to copper so make sure to research your fish and find out the level that your fish can tolerate. The third medication that can be used is Acriflavine (trypaflavine) at a rate of 1 ml per liter of water. This treatment can cause sterility in fish so following the guidelines is very important.