I thought kuhli loach like to dig in sand?
Yeah, they like it, but hiding in pebbles is just as fun. Plus, they'll be able to eat the morsels that the other fish might miss.
"One day...one day, this path will lead us to the White City, and the tower guard will take up the call: the Lords of Gondor have returned!"
–Boromir, The Lord Of The Rings