Do Goldfish Eat Each Other Or Other Fish?

A common concern among aquarists is if their large goldfish would intimidate their smaller goldfish. Moreover, can goldfish attack one another? You have to consider everything when you keep fish carefully. Choose which fish to buy, how many you’ll need, or the tank size your pet fish will need. You must carefully consider the fish’s size, though.

Goldfish can, in some cases, eat smaller fish or their own offspring. This behavior is usually seen when there is a shortage of food or when the goldfish are in a crowded environment. However, it is not a common occurrence and can be prevented by providing adequate space, a proper diet, and a clean environment for the goldfish. It is important to note that keeping multiple fish species together can also increase the risk of predatory behavior, so it is best to research the compatibility of different species before adding them to a shared aquarium.

Consequently, I have put together this article to advise you on the compatibility of goldfish with smaller goldfish and what leads to hostility among them. So if you’re interested in learning more about your goldfish’s behavior, keep reading the article on can goldfish get bored.

What Causes Bullying among Goldfish?

1. Overcrowding

Overcrowding is one of the most frequent factors in fish bullying and violence. Make sure your tank contains a manageable number of goldfish. You should locate your fish in a new home or buy a second tank if you have too many fish.

Overcrowding goldfish

2. Breeding Time

It’s common for goldfish to fight during the breeding season to select partners or as part of displays and dances related to breeding. You can check

Breeding Time

3. Conflict over Resources

You wouldn’t believe how frequently this occurs. You can tell if it is feeding jealous behavior if you observe that they only (usually) start acting this way at mealtimes. Additionally, it usually moves slower than mating activity.

Conflict over Resources

After they have both finished eating, they may occasionally fight. Sometimes just one individual believes the other to have eaten. Each one wants what the other possesses. Typically, this isn’t serious enough to need your help and hardly ever results in any injury.

4. Ferocious species of Goldfish

There are many distinct goldfish variations, and goldfish caretakers occasionally need to figure out which sorts they have in their tank. There is a reputation for some varieties being more dominant and aggressive than others. The Ryukin goldfish is a good illustration of this. It is not a good idea to maintain fantail goldfish or bubble-eyes alongside more aggressive forms of goldfish because they might become vulnerable.

Ferocious species of Goldfish

5. Sickness

Goldfish have the drawback of not usually displaying a great deal of empathy. When one is ill or weak, the others may start attacking or pecking at it, which might exacerbate the issue. Sadly, it does occur. This is why, whenever feasible, I suggest relocating a sick fish from the aquarium to a hospital tank. Such conduct can exacerbate their stress and hinder their ability to heal.


It is nature’s way of removing the unhealthy from a community, though I can’t say for sure. A sick fish is more dangerous and more prone to spread the sickness to other fish. Healthy goldfish may be trying to defend themselves by picking them off.


Even with significant size disparities, goldfish often don’t bully one another. When it’s time to eat, the bigger fish will get the upper hand, but as long as you ensure Bastion receives enough food, this shouldn’t be an issue. However, it’s essential to separate the fish or add a divider to the tank if you continue to feel that the hostility is out of hand.

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