Orange Shoulder Tang Eats Sand?

[Quah]

I have an OST who picks at the sand and often times consumes it. I feed him regularly and he is relatively thick and muscular but he eats sand - like I said. He passes it just fine as well. I'm not super concerned I just don't know what to think about it. I've had him since he was a fingerling and he's grown fast and almost at full coloration in I'd say 10-14 months.

I have the OST, a Purple Tang, a Magnificent Foxface, and an Ebili's Mimic Tang. Most of them also cruise the tank and pick at rocks throughout the day - except for the Purple Tang who spends most of her day with her reflection. They're all kept in a 240 gallon aquarium.

I feed a sheet of Seaweed every day for the four fish I have and I also feed them as much mysis / reef frenzy as they can eat twice a day.

Any thoughts on this?

 

[eatbreakfast]

Some tangs have a gizzard-like organ, so taking in sand helps aid in digestion.

 

[Quah]

Some tangs have a gizzard-like organ, so taking in sand helps aid in digestion.

That makes sense. I thought about that but talked myself out of it. I was kind of thinking it was accidental ingestion - good to know its perfectly normal.