I always thought I needed to keep my devil's hand away from my other corals because it was toxic to the other's. He always reaches out to "touch" anything close enough to get to......my star polyps have stopped him in his tracks. I moved the devil's hand a couple days ago since he was really spreading out. I thought it was mad since I moved it....the star polyps side is withered a bit and not extending. The other side of coral is normal in extension and color! Gonna have to find another spot to keep everyone happy.