Tools · Symptom checker
What’s wrong with my fish?
Tap what you see. Get the likely causes and what to do first.
What do you see?
Recently
Tap every sign you notice. Two or three give the best match.
Questions
Does this diagnose my fish?
No. Several water-quality problems and diseases can look alike. The checker suggests possible causes to discuss with an aquatic vet.
What should I check first?
Record your water test results, temperature, filter operation and visible symptoms. Seek prompt professional help if fish are gasping, losing balance or deteriorating.