Goldfish
Bacterial Diseases in Koi & Goldfish
Bacterial diseases are among the most common and serious health challenges facing koi and goldfish keepers worldwide. Caused…
Moderate To To To Severe
Aquarium fish health · diagnosis & equipment
Diagnose. Treat. Save your fish.
A complete reference for ornamental-fish disease diagnosis — paired with the equipment that prevents, monitors, and treats it. Trusted by hobbyists, breeders, koi keepers, and aquariums.
Find the problem & the fix
Pick what you see on your fish. We'll rank the most likely conditions and show the equipment that helps treat or prevent each one.
Pick a symptom to see likely conditions and the equipment that helps.
Most-searched diseases
Goldfish
White Tail Disease in Koi & Goldfish
White tail disease is a serious and poorly understood condition caused by microsporidian intracellular parasites that destroy muscle…
Moderate To To To Severe
Freshwater Tropical
Cloudy Eye
Hazy or opaque film over one or both eyes — usually a sign of bacterial infection or chronic…
Moderate
Goldfish
Parasitic Diseases in Koi & Goldfish
Parasitic infestations represent one of the most diverse disease categories in ornamental fish keeping. From the microscopic ciliate…
Mild To To To Severe
Freshwater Tropical
Swim Bladder Disorder
Loss of buoyancy control — fish floats, sinks, or swims at odd angles. Common in fancy goldfish and…
Moderate
Freshwater Tropical
Hexamita (Hole-in-the-Head)
Intestinal flagellate parasite causing pitted lesions on the head and lateral line, especially in cichlids and discus. Often…
Moderate
Koi & Pond
Koi Herpes Virus (KHV)
Notifiable viral disease devastating koi populations worldwide. Mortality 80–100%. No cure — only management and prevention.
Critical
Goldfish
Fungal Diseases in Koi & Goldfish
Fungal diseases — most commonly caused by water moulds of the genus Saprolegnia — are a frequent secondary…
Moderate
Popular equipment
See all equipment →Monitoring
Water Quality Sensor Hub
Multi-parameter disease prevention
from $200–$1500
View details →About Fishyfarmacy.com
Healthier fish, fewer treatments
Fishyfarmacy.com helps hobbyists and professionals stop fish disease before it starts. We pair a deep, plain-English diagnosis library with the equipment that keeps water clean, stable, and safe — because the best treatment is the one you never need.
Every recommendation is mapped to the conditions it actually addresses, so you can move straight from a symptom to a fix.
56Conditions documented
35Equipment picks
FreeSymptom checker
Get in touch
Contact page →Questions about equipment, bulk and wholesale orders, or matching gear to a diagnosis? Send a note — every message lands in our inbox and we reply by email.