Fish Diseases

A bloated fish doesn't always mean Dropsy. Learn the most common causes of swelling in aquarium fish, including constipation, internal parasites, bacterial infections, egg development, and organ failure, along with tips for diagnosis and treatment.

Cloudy eyes are a common symptom in aquarium fish and can be caused by injury, poor water quality, bacterial infections, or parasites. Learn how to diagnose the cause, what treatments may help, and when cloudy eyes are a sign of a more serious health problem.

Torn fins are one of the most common fish health issues in freshwater aquariums. Learn how to tell the difference between simple fin damage and Fin Rot, what causes torn fins, and how to help your fish heal quickly.

Flashing, or rubbing against decorations, is one of the most common warning signs aquarium fish display. Learn what causes fish to flash, how to distinguish normal behavior from disease, and which symptoms can help identify the underlying problem.

Rapid breathing is one of the most important warning signs aquarium fish can display. Learn the most common causes, including low oxygen, gill flukes, Velvet Disease, and water quality issues, along with practical steps to diagnose and address the problem.

White stringy poop is one of the most common symptoms observed in aquarium fish, but it doesn't always indicate internal parasites. Learn the most common causes, how to evaluate accompanying symptoms, and when the issue may require further investigation.

White spots are one of the most common symptoms aquarium hobbyists encounter, but they aren't always caused by Ich. Learn how to identify the most common causes of white spots, recognize accompanying symptoms, and narrow down the correct diagnosis before starting treatment.

A fish refusing food is one of the most common symptoms aquarium hobbyists encounter. Learn the most common reasons fish stop eating, how to identify potential health problems, and what steps to take before a minor issue becomes a serious concern.

Lymphocystis is a viral disease that causes distinctive cauliflower-like growths on aquarium fish. Learn how to identify the condition, distinguish it from Ich and fungal infections, and understand why many affected fish can recover with proper care and husbandry.

True fungal infections are less common than many aquarium hobbyists believe, but they can still occur when fish are injured, stressed, or weakened. Learn how to identify fungal infections, distinguish them from Columnaris, and explore effective treatment and prevention strategies.

Fish Tuberculosis is a chronic bacterial disease that can cause weight loss, spinal deformities, wasting, and unexplained deaths in aquarium fish. Learn how to recognize the warning signs, understand the risks, and explore prevention strategies for one of the hobby's most challenging diseases.

Hole-in-the-Head Disease is a common condition affecting many cichlids, particularly Oscars, Discus, and Severums. Learn how to recognize the early warning signs, understand potential causes, and explore treatment and prevention strategies before lesions become severe.