Royal Gramma throwing sand around

[Thunderrap]

So for the past, I would say, a month now my Royal Gramma is scooping up some sand in his mouth, swimming over a little zoa island, and spitting it out all over the place. What would cause a fish to do that and how do I get it to stop? I have to blow off some zoa's and a trumpet coral I have on there all the time and I fear it's causing some issues with them.

 

[Cell]

Not uncommon. Might try building it a cave of some sort.

 

[Glenner’sreef]

Had a yellow head sleeper goby who did that. Got rid of him.