I got a rbta about 7 months ago and it has been doing well till recently. It used to be huge a take up a large part of my tank. Then it split after about 4 months of having it in my tank. The spilt anemones have both been doing well till a month ago when they both moved to different places in my tank. They both open up but not as much as they used to. The larger one also lets go of the rock sometimes just to fall on the sand and crawl back up to the same rock. Any ideas why my anemones and not as open as they used to be?