Anyone done this in their tank? Some of my zoas have migrated off the top rocks and are now starting to cover the back glass. You can see them in the top left side by the end of the overflow box. I'm really excited by this development but wonder how far they can go? There is coralline on the back glass and some film type algae that seems to feed all my inverts. I wonder if the zoas will take this food source away from my snails and urchins eventually?