Answer 3-5 quick questions about what you\'re seeing. We\'ll narrow down the likely cause and link you to the matching disease/algae/water-chemistry guide.
The diagnoser uses symptom patterns from our 24-page disease database. Each guide details symptoms, causes, treatment options, and prevention. The most reliable diagnosis still comes from a water test + close observation - this tool narrows the search.
If symptoms persist after 48 hours of treatment or fish are dying rapidly, post in Reef2Reef or Fishlore with a photo + parameter readings.