John, Thank you. I completely forgot to mention it will be a freshwater tank. Thank you for the advice, very helpful. Now the question of just simply fired stoneware without any glaze, should that be safe on its own? I am heading over to Robert Comptop's site to further investigates. More questions are no problem, it is better to do research first before potentially harming the fish! (The fish that I don't even have yet). I just really don't enjoy any of the mass produced trinkets and toys to put into tanks.... I'd rather have my own designs in there.