Once, i put my supers in a dish with calcium and i remember one time when one of mine grabbed a super, walked away and ate it then came back to the dish, sniffed around and shoved his head right in to the calcium and came up with a small mouthfull of it lol
I never saw mine do it. Though I dust daily so they are probably getting enough of it for them. But I leave it in incase. Mine just walk through it -.-
My aft prefers to dig in his dish and throw it everywhere (Usually within the hour I fix it)...very fun to clean...I've currently taken it out because of that lol.