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7 8 cm ? About the same length as a finger? Are there such big seams in your tiles? Listen to you like a male termite.
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Centimeter!!!
Only corpse worms are so long!!
Knock on the wall and take a look!!
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Centimeter or millimeter?
Just pour it with potassium permanganate water.
Bugs can't see clearly, don't know anything, but you can use insecticidal aerosols, and you can also use cockroach medicine, you can get rid of them.
Go buy cockroach chalk, something like chalk, a few cents a piece, mash it into powder, sprinkle it on the place where it is frequented, clean it up every other week, and stir it with quicklime if it is serious. >>>More
Moth gnats are also known as moth midges and hair midges, commonly known as moth flies and moth gnats. This is its larvae.
You can clean the tile gaps thoroughly, it is not easy to attract ants, and you can use the shield king to clean the dirt on the tile joints.