This just gave me a cool idea! I recently set up a little Anemone tank for my Joker Anemones. If I moved them over to the sump and just swapped the lighting schedule by 12 hours I could keep the Nems in a more controlled environment!
Ohhhh, I like that idea! A friend of mine says that he can cause his nems to split by adjusting their light cycle... obviously, that's a lot easier to control in the sump.