The low light corals are beautiful, but they wear me down. I think I will sell my sun coral, as my orange Scleronephthya is growing like a weed and therefore easier for me to care for. The red gorg did well until I lost it in a rock move....
None of these corals would belong in an immature system, or one without adequate filtration as they have high feeding requirements since they are non-photosynthetic.