| Disease | Symptoms | Treatment |
| White Spot Disease/Ich | White spots on body, Clamped fins, Scratching against surfaces, Lethargy and loss of appetite | Increase water temperature, Salt treatment, Medicated baths, Anti-Ich medication, Quarantine infected fish |
| Fin & Tail Rot | Ragged or punctured fins, Change in color, Incremental degeneration | Anti-bacterial or anti-fungal treatments, Improve water condition, Vitamin supplements, Quarantine infected fish |
| Swim Bladder Disorder | Difficulty swimming, Abnormal behavior, Less active | Change diet, Lower water depth, Medication, Fasting |
| Velvet (Oodinium) | Velvety coat, Scratching behavior, Clamped fins and lethargy | Anti-parasitic medication, Increased temperature, Darken the environment, Quarantine infected fish |
| Columnaris | Cotton-like patches, Altered breathing and diminished activity, Reduced food intake | Use of antibacterial medication, Improving water quality, Raising the temperature, Salt treatment |
| Gill Flukes | Rapid gill movement, Scratching behavior, Red or swollen gills | Anti-parasitic medication, Salt bath, Increase water temperature, Quarantine infected fish |
| Dropsy | Bloating or swelling, Pinecone-like scales, Lethargy and loss of appetite | Antibacterial medication, Epsom salt baths, Improve water quality, Isolate infected fish |
| Black Spot Disease | Appearance of black spots, Scratching behavior, Reduced appetite and lethargy | Anti-parasitic medication, Quarantine infected fish, Tank cleaning and water change |
| Constipation | Bloating, Less or no fecal matter, Swimming difficulty | Diet change, Fasting, Epsom salt bath |
| Scoliosis (Bent Spine) | Bent or curved spine, Swimming difficulty, General weakness | Improved diet, Antibiotic treatment, There’s no guaranteed cure |
| Fish Tuberculosis | Weight loss and lethargy, Loss of scales and skin color, Lesions and ulcers | Antibiotics, Isolate infected fish, Euthanasia in severe cases |
| Popped Eyes | Protruding eyes, Cloudy eyes, Swimming difficulty or lethargy | Water change, Antibiotic treatment, Isolate infected fish |
| Camallanus Internal Worm | Visible worms, Weight loss and decreased appetite, Lethargy | Anti-parasitic medication, Water changes and tank cleaning, Quarantine infected fish |
| Viral Hemorrhagic Septicemia (VHS) | Hemorrhaging, Decreased activity and appetite, Protruding eyes or bloated belly | No established cure, Isolate infected mollies, Supportive measures |
| Swollen Gills | Enlargement or redness of gills, Accelerated gill movement, Diminished appetite or lack of energy | Change of water and evaluation of quality, Application of antibiotics or anti-parasite treatment, Segregation of infected fish |
