A tiny bug that lives in tile grout is a mite. It goes through a larval stage that makes it appear to be a worm. As a result, these mites are often called tile worms.
Sounds like Silverfish or firebrats is another term as used to be found under hearths, live in the spaces between grout lines. Very difficult to be rid of but don't seem to cause harm
Gnats and fleas are both tiny insects that can jump. Fleas are the probable insect in this description that eat concrete.
aphid
A flexible joint is recommended between a splashback and bench top or counter because these are different structures and unless specifically designed and braced, will move differently. Even a tiny amount of movement will cause a crack in a grout that is not flexible. This is why silicon joints are often used at any corner junction of tiles or splashbacks.
The Seventh Brother
the tiny live in china
Mosaic
"Tiny real name" means that someone's real name is very small, or tiny.
a bacterium is a tiny organism that lives in the air
the name of a tiny freshwater fish is a minnow
KRILL, a tiny shrimp that lives in tremendously large schools, small fishes are also eaten by whale
Tiny Archibald's birth name is Nathaniel Archibald.