a terrarium
empty.
gravel rocks sand peebles water
No because the sand will make the water dirty, small rocks are usually the best.
Yes, but be prepared for some cloudy water.
Yes, it would.
Water
Its the rock, sand, gravel, whatever on the bottom of an aquarium.
You mean substrate?
the name which is used for separating sand from water is called filtering.
because the fish want it
The root meaning of water that is connected to the word "aquarium" is "aqua". "Aquarium" refers to a place where water-dwelling plants and animals are displayed.
I have a 120 Gallon aquarium with sand. They love it.
Empty and made of glass, it weighs about ten pounds. Filled with only water and made of glass, it weighs about 135 pounds. Filled with water, substrate, and decorations, it will weigh about 150 pounds. Picking up an aquarium that is filled with water is a very stupid thing to attempt. Even if you can handle the sloshing weight, the aquarium can not. If you do try to move an aquarium while full, please have a friend videotape it for youtube. Water weighs 8.345404 per gallon.