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Like all fish they breathe through their gills, thus getting oxygen (air) from the water, they do not need to surface for air unless the water had a poor oxygen level.

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14y ago

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Why do goldfish swim to the surface when a shadow of a hand appears at the top of a tank?

Because it is there instinct ! haha


Can goldfish remember?

Yes. Mine remembered that I was the one who fed them and would swim to the top of the tank whenever I entered the room.


How do you get fish to swimin the middle of tank?

Different types of fish swim in different layers of the water. Top floaters, bottom dwellers and middle swimmers.


Why are the goldfish hanging out at the top of the tank?

Goldfish may hang out at the top of the tank because they are trying to get more oxygen from the surface of the water. This behavior can indicate that the water in the tank may not have enough oxygen for them to breathe comfortably.


Do you fill a goldfish tank to the top or leave a gap?

leave a gap


How many discus can fit in a 30 gallon tank?

Not more than 6, discus need some room to move around but are middle dwellers, meaning the tend to stay and swim in the middle of the tank, no near the bottom or top.


Is it normal for goldfish to be at the top of tank?

It is normal for a goldfish to occasionally swim around the top of the tank. If they are spending an elongated amount of time up there than there is usually a problem with your water quality. The most likely cause is not having enough dissolved oxygen in the tank's water- you can easily fix this by adding an aerator to the tank. Run some water quality test- if anything is not within normal limits do some large 50-75% water changes until they return to normal.


What species prefers to swim in the top of the tank?

Danio fish like to swim on the top, and they like to swim back and forth all of the time( mine do)


Can you keep a goldfish in an opaque glass tank?

A goldfish can live in an opaque glass tank as long as you keep up with necessary water changes. Like a small outside garden pond goldfish are only viewed from the top.


How can I prevent my goldfish from making bubbles at the top of the tank?

To prevent your goldfish from making bubbles at the top of the tank, ensure proper water quality by regularly cleaning the tank and maintaining appropriate water parameters. Additionally, provide adequate aeration and surface agitation to prevent bubbles from forming.


My fantail goldfish seems to stay at the bottom doesn't swim round very often but does swim to the top to get some food. What is wrong?

Goldfish are moderately inactive fish. They will spend much of their time just floating or sitting at the bottom.


Your goldfish is upside down at the top of the tank Is it dying?

It's most likely already dead.