Yup, both of my corns did that when they were still in tanks and still small enough to do so. My bloodred would get up there and then just chill for awhile, it's such a funny behavior. I wish I had taken pictures. The first time I saw them do it though, I was horrified and really worried that they could hurt themselves... but, apparently not It never seems to get old for them. Does she have anything to climb on? I mean, they'll still do it anyway, but it's always fun to watch them climb, and they seem to enjoy it too.