great tip dave..
another one that i wanted to mention, but totally forgot about was the use of a 2-3" dia.
PVC tube that is about 3-4 inches long (depending on the size of "Mr tentacles".. wait is that squidward from spongebob??? any who...
you can mount the tube where you want and the anemone will use that as its "cave".
it should be mounted in a vertical or preferable an angles position, and not horizontally..