It's probably looking for a place to call home. Mine did that when I first got him. He was looking for the right spot. Then he never moved until the day I took him out.
180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18