If the fish is dead it may sink. Otherwise a fish can go anywhere in the tank by using its swim bladder. If the fish seems to be struggling to get to the surface, the fishes swim bladder is damaged and the fish should be euthanased.
They will usually do this if they sense that a fish is sick or is dying. Usually they will try to eat it
usually its cos there scared from traveling or there getting used to there new tank.
they just settle at the bottom of fish tank
It freezes there blood. Which is cold blooded killing them from hypothermia. ( Might turn a color or sink to the bottom of the tank.)
gravel
I suggest that you learn more about your fish in your aquarium. One of your fish might be a bottom sucker which means that they eat all of the dirt on the side or bottom of your tank. If one of your fish are bottom suckers, that's probably the reason why your aquarium is clean. If none of your fish are bottom suckers, than somebody must be secretly cleaning your tank for you.
heat water up, put it in the sink and then put the fish in the sink. (plz remember to put the plug in)
It dies
All drains lead to the ocean, but when your fish dies, it is actually better to bury it because if it died from a disease,then the disease could survive the sewage system and stay in sink water.When people fill up their fish bowls, the disease could still be in the water, killing hundreds of local fish. MORAL OF STORY:Don't flush dead fish down the toilet.Bury them.
Fish eggs, fish sperm, mold.
Yes, because water is heavier then gasoline
food flaots