At night anemones shrink down a little and is smaller than the day. How ever, sick anemone deflates, completely shrink down like letting all the water out of the anemone and they look much smaller. If you anemone cycle with deflates and then inflates, it is not doing well and will most likely died in a few days to a week or two. When anemone first added into a tank, they often deflates once or twice but should not do this on daily basis.