Why would one goldfish lie motionless most of time whilst rest swim around? Is it a social outcast?

If you have different varieties of goldfish, make sure they are compatible. The slower fancy varieties might get stressed out by faster ones like comets. Yes, they might feel like outcasts and keep to themselves. Some goldfish might even get aggressive with another and in that case you need to one that is being badgered to another tank.

Why are all goldfish so lifeless and tend to stay at bottom of tank most of time, like they are very tired?

If they aren’t swimming as they usually do, something is definitely bothering them.

If you tank is brand new and goldfish are having a problem because tank has not been cycled. Wait a while and watch. Make sure you cycle tank before you put them in because a new tank cannot deal with ammonia that goldfish produce.

If you tank is an old one and goldfish are suddenly more still than usual it could be that toxicity of water is bothering them. So change water. When your goldfish seem inactive, you must check water for nitrites and pH level.

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2. Why do goldfish sometimes attack eachother?

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