Yeah Deb's right JT, those are the brains feeder tentacles., and yes they mostly feed at night. I place a dime size chunk of food in mine once a week to keep it happy. My brain only feeds in this way when it's hungry, yet my donut does this every night even if it's not hungry
Here's my donut doing the same thing
http://www.canreef.com/phpBB2/viewtopic.php?t=7146