Fish Diseases

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.

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.

Dropsy is one of the most recognizable conditions in aquarium fish, but it's actually a symptom rather than a disease itself. Learn what causes dropsy, how to identify the warning signs, and what steps you can take when a fish begins showing symptoms.

Columnaris is a fast-moving bacterial disease that is frequently mistaken for fungus in freshwater aquariums. Learn how to recognize the symptoms, distinguish it from true fungal infections, and explore treatment and prevention strategies before the disease spreads.

Fin rot is one of the most common diseases encountered by aquarium hobbyists. Learn how to distinguish fin rot from simple fin damage, identify the warning signs early, and explore effective treatment and prevention strategies.

Camallanus worms are one of the most recognizable and feared internal parasites in the aquarium hobby. Learn how to identify the warning signs, understand how infections spread, and explore effective treatment options before the parasite affects your entire aquarium.

Anchor worms are one of the few fish parasites visible to the naked eye. Learn how to identify these parasitic crustaceans, recognize the warning signs, understand how outbreaks occur, and explore effective treatment options for aquarium fish.

Gill flukes are among the most common parasites found in aquarium fish, yet they're often overlooked because they live inside the gills. Learn how to identify the warning signs, understand how fish become infected, and explore effective treatment options before serious damage occurs.

Internal parasites are among the most common yet overlooked health problems in aquarium fish. Learn how to identify the warning signs, understand potential causes, and explore treatment options before a minor issue becomes a serious problem.