Puffer eating sand

[Bizbomb]

I had been a little concerned about my 4" Fahaka because his belly always looks full. After observing him for a few weeks I have noticed that he is eating sand and passing it through his system; only to eat more sand (pool filter sand). I was wondering if anyone else has observed this behavior or could foresee any possible health problems.

[Mezzovex]

mine huffs at the sand when he is hungry. he will look at me, then go to the bottom and huff a bit away, then come and look at me agian. then swim to the top of the tank.

[Troender]

I know some puffers eat small stones. Here's a topic about the same thing.

[Bizbomb]

Thanks for your replies. They put my mind at ease.