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If your molly fish is showing physical symptoms such as difficulty swimming or resting on its side, gasping for air, white or black patches on the skin, swelling, fin rot, pointed scales, red mouth or anus, and tumors, then it is likely to have molly fish disease. Provide the correct treatment as soon as possible after identifying the symptoms. The number one reason molly fish get sick is the aquarium not being properly cycled. People think the word “cycled” means they just let the tank sit.