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Goldfish Lethargy: Water Quality Beyond Basic Tests

Two comets in a 30-gallon tank sit at bottom despite good pH/ammonia tests. Robyn points out missing tests (oxygen, nitrates, organics) and recommends:

Weekly 50% water changes regardless of test results.
Add air stone for oxygen.
Use fresh activated carbon for organics.
Add aquarium salt (1 tbsp/5 gal) and dechlorinator.

Routine maintenance prevents invisible water quality issues.

Pond and Water Gardening: Goldfish Dying Slowly: Mystery in 4,000-L Pond; Indoor Eagle Habitat Pond: Algae, CO₂, Test Kits; Baby Goldfish Die After Owner’s Overnight Absence: Water Chemistry Suspect; Fish Hiding After Predator Visit: Recovery Timeline & Protection; Goldfish Hiding After Heron Visit: Long-Term Wariness & Recovery; New Fish, Cold Weather, or Water Quality? Why Pond Fish Stop Eating; Calico Goldfish Care: Temperature, Water Changes, and Salt; Emergency Koi Relocation During Liner Replacement in Caribbean; Goldfish "Sunbathing": Normal Behavior or Oxygen Problem?; Heron-Attacked Goldfish: Quarantine Care for Recovery

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