if you don't somthing to produse eir they have to go to the top to get eir
Bettas do this because they are tropical fish and like warm water. They like being at the top because they breathe air like people. If they are sleeping or relaxed, they will often hand near the top so they can just constantly breathe.
If there is other fish in the tank he doesn't like them or he could have air in his body which floats him to the top and they can die from that .
Dead or dying
They want feeding.
to eat food
food flaots
opline gourami, guppies ,hatchet fish
Some fish prefer swimming at the top of the tank while others the bottom or middle.
Could be anywhere.
well it has to have light if you cover only the top it will be ok:o
Fish make bubbles at the top of the tank because they release excess air from their swim bladders, which helps them regulate their buoyancy and stay afloat in the water.
you have to find the fish tank an d on top of the fish tank there are 2 poles and that is where you put the head