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ProblemsFilter Crash

equipment

Filter Crash

The biological filter fails after aggressive cleaning, media replacement or a long outage.

Symptoms

Ammonia rises within days of cleaning the filter
Cloudy water and stressed fish
Sudden biofilm die-off smell

Common Causes

Cleaning all media in tap water at once
Replacing all media simultaneously
Long power outage in hot weather

What to Check

Ammonia and nitrite trend
Media condition and cleaning history
Biological load vs media capacity

What Not to Do

Do not deep-clean media with hot or chlorinated water
Do not replace all media at once

Recommended

The Nitrogen Cycle: The Foundation of Every Aquarium Different Types of Aquarium Filters: Pros and Cons

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