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They could be seeing themselves in the reflection of the glass of your tank, but since goldfish do not have the capacity to recognize themselves in a reflection they think it is another goldfish and attempt to swim towards it.
It has nothing to do with having a short memory span as the previous answer said, because goldfish actually have a long-term memory span of about three months.
What else can I help you with?
Why do goldfish flick water at the top of tank to make a loud bang its like they trying to get your attention lol?
They may try to get some oxygen XD
Can fresh water mussels live in goldfish tank with goldfish in the tank?
Yes
What should you put in your goldfish tank?
It is important to remember to put things in a goldfish tank, even goldfish get bored. Some of my suggestions for tank decor are artificial plants and a "hidey hole" for your goldfish.
Can goldfish stay in the tank when platy fry are in?
You should not have goldfish and platies in the same tank ever.
Can shrimp coexist with goldfish in the same tank?
No, shrimp and goldfish should not be kept together in the same tank as goldfish may eat the shrimp.
What are the recommended tank size requirements for keeping a goldfish in a 5-gallon tank?
A 5-gallon tank is not recommended for keeping a goldfish. Goldfish require a larger tank size to thrive, ideally 20 gallons or more for a single goldfish. A larger tank provides more space for the goldfish to swim and grow, as well as better water quality.
How does the size of a goldfish tank affect the growth of the goldfish?
The size of a goldfish tank can affect the growth of the goldfish. A larger tank provides more space for the goldfish to swim and grow, leading to healthier and potentially larger fish. In contrast, a smaller tank can restrict the fish's movement and growth, potentially stunting their development.
Can four goldfish live in a ten gallon tank?
depends, can a ten gallon tank live in a goldfish
What is the benefit of breeding goldfish?
getting more goldfish in your tank
Can cherry shrimp coexist with goldfish in the same tank?
No, cherry shrimp should not be kept with goldfish in the same tank as goldfish are known to eat shrimp.
If your goldfish is about 2 and a half inches long how big does its tank need to be?
Regardless of the type or size of goldfish the minimum acceptable size of an aquarium for a goldfish is 30 gallons. Buy a tank that is at least 30 gallons if you plan to have goldfish. You can comfortably fit 3 goldfish in a tank this size but no goldfish in a tank any smaller. Goldfish are essentially pond fish and need lots of space to swim; they will not thrive in a small aquarium.
Can goldfish mate in 5 gal tank?
no. you should have 10gal of water per goldfish. you shouldn't have goldfish in a 5gal tank at all. they are huge waste producers
