Let's say I have a typical 10 gallon tank with dimensions 10" x 20" x 12", and it's filled halfway (5" in height) with dry sand for hermit crabs.
If I fill the tank up with water, will the level of sand decrease?
I'm thinking that it doesn't because of this answer -- sand is insoluble. So the water would just fill the gaps of air first. If that's not the case though, what are some things to take in to consideration?
Not quite sure where this question belongs, so if it's in the wrong place, let me know -- or mods, feel free to move it. Thanks!