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what are the signs of stress in aquarium fish?

i was told that when a aquarium fish sets still and wiggles it's tail that is a sign of stress is that true?

Public Comments

1. maybe.... the fish either stay on the top or bottom of the tank... staying in one place... hiding.. and rapid breathing... do a 50% water change to you aquarium when this happens.. It's usually due to bad water quality.
2. INACTIVE , TOO ACTIVE ,LINGERING AT SURFACE , LYING ON BOTTOM , SWIMMING ERRACTALLY ECT.
3. Well, fish will often manifest symptons such as Ich, finrot, dropsy, clamped fins, lethargy, trying to jump out of the tank, etc. Stress in fish is easy to avoid. Be sure to keep up with week water changes, and provide lots of cover (plants etc) for the fish to feel safe in. Do not overstock your tank.