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[0] Protozoa (Internal Parasite) [1] Spironucleus (Hexamita) [2] Lesions in cichlids along head and lateral line (hole-in-head); weight loss in angelfish [4] Avoid adding the water from the bag of new fish into your aquarium, and discard the water in the fish bag. Quarantine new fish before adding them to your aquarium in a separate isolation tank. [3] 
Feed fish food containing Metronidazole.
Diagnosing Fish Ailments: How To Analyze and Treat Problems. | PetSmart
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