Thanks Fox; coloration and pattern match basic return results but I get a lot of hits about the Red Planaria Flat Worms. There was no red hue and it was circular in shape. It was pretty fibrous when holding with the tweezers. This is a new tank and it would be disappointing to already have pests.
The first picture is where I found it and it looks like it has layers. In the middle, there were three distinct (eyes?) brown spots in a triangular patter, then a yellow layer; then a white layer and then finally almost translucent layer. I expected it to be fragile when pulling it out but it wasn't. I did not see it move after pulling it from the tank.