Ok, I have had a toadstool fo about 1 week. For the most part it has been, moderately open to very open most of the time. I have even seen times where the polyps are 75% extended. But tonight it is as small as it can possibly make itself. Between yesterday (when it was nearly 100% extended with 75% plus polyps open) and today where is is a shriveled little thing there have been no changes in water quality, flow, or light level. So why the hugh difference is extension and size?