It dies
The water sinks to the bottom. If your pick-up in near the bottom your engine will quit. You will need to drain the tank.
The water sinks and pools at the bottom of the tank
Yes. Algae wafers are food that sinks on the bottom of the tank. it is food for some bottom feeders like cat fish. However, some upper or mid strata fish will eat it. Unless they're carnivores.
What happens is the food rots in the tank. This rotting/decay creates gas (Ammonia) and that will poison the fish and burn its gills. This results first in sick fish and then death.
they just settle at the bottom of fish tank
gravel
Gold fish will swim upside down if they have a swim bladder infection, try feeding it fish food that sinks because, when it eats food at the top of the tank it swallows air that goes to it's swim bladder causing it to go upside down at the top or bottom of the tank. Hope I Helped :)
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.
Then your filter is not on.
in a tank or the ocean?
Fish eggs, fish sperm, mold.
food flaots