I have a candy cane in one of my tanks that has been in there for about a week and half. Ive been looking at it at nights to see when its tentacles open so i can try to feed it some mysis shrimp or somthin. But no matter what time i look i never see them. If the moon lights are on or off...nothing.Their very closed shut at nights..is that normal...almost like their being touched. They look healthy during the day, all poofy and thick, but i never see them try to feed. Any suggestions??? TIA