for decoration use.
they just settle at the bottom of fish tank
gravel
A fish sinks to the bottom of the tank because its body is denser than the water, causing it to be pulled down by gravity.
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.
The key to her diary is in the treasure chest on the bottom of the fishtank but you need to spill fish food into the tank to stop the fish from attacking you the food is on the shelf above the tank
Its personal Preference really, some people leave stones out of the tank as they find it easier to clean the tank out without having to get the stones out and they also think it looks quite neat. However, it really varies from person to person. John, Fishpert
No. all fish need fins to swim. Or they would just stay at the bottom of the tank and die.
It dies
Certain types of fish, such as catfish and plecos, are known for cleaning the bottom of a tank by consuming algae and leftover food.
Fish eggs, fish sperm, mold.
TheType of fish that you put in the tank and what they need to survive
food flaots