I know you wouldn't give them dirty sand-- was thinking more along the route of impaction.... but wouldn't think they would even try to eat it...
Sure didn't want to concern you unneccessarily.,.. but just wanted to express my concern...
Also, even tho this doesn't apply either... I worked at an organization that boarded exotic birds-- they used Silica Sand on the bottom of the bird perches... one day found a bird dead -- thought it had gone down to eat the fallen fruit, which then had been covered w/ the silica sand...
Silica sand is a form of 'ground glass'... in it's natural form...
Beautiful birdies.