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ProblemsFin Rot

fish

Fin Rot

Fins look frayed, ragged or are visibly shrinking with white or red edges.

Symptoms

Frayed, ragged or disintegrating fins
White or red margins on damaged fin tissue
Fins shorten progressively

Common Causes

Poor water quality (high ammonia or nitrite)
Injury followed by bacterial infection
Overcrowding and chronic stress

What to Check

Ammonia, nitrite and nitrate levels
Fin condition over several days
Signs of bullying or fin nipping

What Not to Do

Do not medicate before fixing water quality
Do not treat in tiny unfiltered containers while medicating

Recommended

How to Change Aquarium Water Without Stressing Fish Your First 30 Days With an Aquarium: A Beginner's Journal Tool: Water Change Calculator

This guide is informational and does not replace professional veterinary advice. If fish are severely ill, consult a veterinarian.