Aquarium Diseases
Diagnosis and treatment of disorders.

Diseases and Medication of Angelfish
List of common ailments and recommended treatments.

Fish Diseases FAQ
Prevention, diagnosis, and treatment of common ailments.

FishDoc
Ornamental fish disease diagnosis and treatment.

Freshwater Fish Diseases and Treatments
Index of various disorders, symptom and diagnostics chart and recommended treatments.

Koi Vet
Koi health and disease treatment.

Pond Life
Guide to small and microscopic pond life, many of which can be found in the home aquaria, including Hydra and Protozoa.

Disease Index and Treatment
Checklist, primary symptoms, afflictions and remedies.

Osmoregulation
Article on osmosis and osmotic stress.

Algae-control.com
Diagnostic tools, symptoms, ailments, treatments and water quality. Written by a veterinarian in fish health. Dr. Erik Johnson.

The Sick Fish Page.
Forum, diagnostic quiz, diagrams of common fish illness and treatment suggestions.

Fishy Farmacy
Diagnosis of diseases and suggested treatments. Includes a section for the most common problems.

Diagnostic Guide to Identifying Disease among Goldfish
Common and not so common ailments are included, plus problems caused by incorrect water chemistry.