Im thinking about adding my next batch of corals. This time im looking to get corals that grow vertically and not encrusting. I THINK, I might be mistaken, that a "green Slimer" is a coral that has one stalk and grows vertically and doesn't encrust. Im looking for info on coral that grow this way because I dont want them to take up too much rock space, I only have a 40B tank. What are some corals that do this? Im ok with any all suggestions, throw them on there but im leaning more towards SPS.