sedimentation
Its the rock, sand, gravel, whatever on the bottom of an aquarium.
To effectively clean and maintain sand for your aquarium, you can wash the sand by rinsing it thoroughly with water until the water runs clear. This helps remove debris and dirt. Repeat the rinsing process until the water remains clear. It is important to use a fine mesh sieve to prevent the sand from washing away. Additionally, you can also use a gravel vacuum to clean the sand while doing regular water changes in your aquarium.
You mean substrate?
The settling rate of the sand particles and the flow velocity of the stream are the two main factors that determine when the sand will settle out of the stream. Higher settling rates and lower flow velocities typically lead to quicker settling of the sand particles.
because the fish want it
I have a 120 Gallon aquarium with sand. They love it.
a terrarium empty.
Yes ofcourse you can have them in your saltwater aquarium. You have to provide some space in your tank with good sand and feeding sand dollars is easy, for they mostly eat suspended organic matters and other fish wastes.
Sand Masters - 2011 Aquarium of the Pacific 1-12 was released on: USA: 21 August 2011
yes you can
Yes, but be prepared for some cloudy water.
No because the sand will make the water dirty, small rocks are usually the best.