Simple Rules for Working with Aquarium Fish
✔️ If fish are dying in the aquarium for unknown reasons: Transfer all fish to another tank. Investigate what is happening. Mass mortalities can vary: ⚠️ Different species are dying simultaneously. Different genera and families have distinct lifestyles, physiology, and immune responses. If multiple species die at once, the cause is more likely water chemistry rather than a pathogen. ⚠️ One species dies quickly and massively. This is also often related to water chemistry — the most sensitive species reacts first. ...