I have had my open brain for about two months and never saw his tentacles until last week! I quickly fed him a small piece of shrimp. It was very cool. I have not seen his tentacles out since. I figure I will just keep an eye on him and feed him when he is hungary!!! Mine also looked bloated after he ate. It is stange how they can alter their appearance from a small shriveled coral to all bloated!!!
"So God created the great creatures of the sea and every living and moving thing with which the water teems...And God saw that it was good" Gen1:21