| yep.. totally normal for most all clown/damsel fish.
they wont all do it, but to have one that does, is not uncommon.
heres a trick.
let the fish find a place he/she likes. and when you get a chance, bury a 4" ceramic tile about a a half inch or so under the surface of the sand.
the fish will go back to redig the whole, and will run into the tile. it will likely clear off the whole tile, but needless to say, it wont go through the tile.
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