Thank you. I have looked at ShareCG and Renderosity's freebies, and it's not there. 3-D-C has a very similar but older prop called "The Swamp" which I've tried, but it's not the one I had. The one I'm looking for is circular and looks very much like a crater with a speckled greyish texture and a textured morphing fluid plane; the one still available is oblong and looks kind of like a bathtub. I'm certain that it was a Christmas give-away here on Renderosity about five or six years ago, but I'll be damned if I can find it again. I always want to say that it was called "alien slime pit" or something similar.