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.
Because it is there instinct ! haha
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.
Different types of fish swim in different layers of the water. Top floaters, bottom dwellers and middle swimmers.
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.
leave a gap
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.
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.
Danio fish like to swim on the top, and they like to swim back and forth all of the time( mine do)
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.
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.
Goldfish are moderately inactive fish. They will spend much of their time just floating or sitting at the bottom.
It's most likely already dead.