Matt Wandell (some may already know who he is) from the Monterey Bay Aquarium (former Steinhart / California Academy) recently did a talk on Fish that are considered "Expert Only" in the hobby. Whether it's Feeding, Hardiness, etc, There's a lot of good tips in here that I personally found helpful for future builds and species and I thought that it would be helpful to share here as well. Some species he goes over are Purple Queen Anthias, Garden Eels, Copperband Butterfly, and Moorish Idol for the more popular species that are more frequently attempted