Posted: Thu Nov 10, 2005 8:25 pm
RES in the wild do occasionally eat a pebbles, and one explanation given for them doing this is that it aids in digestion. They are, however, free to roam, and I wonder how many pebbles they actually eat before they move on to forage for more food, escape predators, whatever. This, to me, is somewhat different than a turtle captive in a tank that has the bottom covered with small pebbles and not much to do, who is either hungry, looking for calcium (one reason why at least captive turts are thought to eat rocks) or is trying to get at some morsel trapped in those rocks. The changes of getting impacted from eating them would seem to be greater (you're right, impaction is when an object is unable to be passed, usually because it's too large).
I have heard of people using sand, although to me cleaning would be a pain/nearly impossible. I don't know what kind of filters they're using (would the filter be damaged if sand were sucked into it?) and maybe someone who does have sand could address those issues.
Just as a thought, why not have rocks that are a little larger than your turtle's head (can't eat them) and not so many that they're inches deep on the bottom (i.e., just enough to cover the bottom.
Or, you could put some sort of background on the bottom of the tank (under it). Nothing on the bottom, but the bottom wouldn't appear bare.
Or, you could use larger flat pieces of slate to cover the bottom of the tank...
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-