Fungus
| Symptoms | Diagnosis | Treatment |
| Greyish-brown cottony tuftftlike material covering body. May occur on a fish after injury. | True Fungus, normally caused by Saprolegnia. | If entire tank is affected, treat using a methylene blue solution or other proprietary TRUE fungus medication. If only one or few fish are afflicted, remove the fish and treat affected area directly with a methylene blue or malachite green solution, being careful not to let solution get into gills. |
| Thick greyish-white marks around mouth or body of fish | Mouth or Body Fungus, actually a bacterial disease usually caused by the bacterium Flexibacter. | A proprietary antibiotic containing erythromycin . |
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