I have had my anemone for about a month now and noticed from time to time that the tentacles shrivel up at different sections and times throughout the day. They also change color from pink to a dark purple. After a few minutes the tentacles return to a normal. Chemistry, tempurature, and salinity are all normal in a 26 gallon tank. I think it is a Stichodachtyla Gigantea (Giant Carpet Anemone) Just wondering if this is normal?