I believe elegance corals used to be quite hardy and then for some unknown reason collectors have been getting sicker and weaker specimens.
Anyways, Torch coral (as well as Hammer, and Frogspawn) is a LPS that enjoys moderate light and moderate flow. The light can easily be a bit higher, especially if you plan for SPS, as long as they are towards the bottom; however, if the coral is really really expanding, it probably is not getting enough light. This group of corals do come from "dirtier", less brisk water conditions than sps; however, this does not mean to skimp on the filtration or flow. However, do not place them directly in front of a strong powerhead, they like random currents, preferably some sort of surge. Torch corals, and its relatives (hammer and frogspawn), are strong stingers and specimins can quickly kill fellow corals due to their long sweeper tenticles. 6" distance is a good rule of thumb. I believe torches and thier kin do not like softies due to space competition. Finally, all of these corals will eat larger pieces of meaty food.
Oh, yeah. Torches, Hammers, and Frogspawn may like to be placed close to other Torches, Hammers, and Frogspawn (not necessarally the same though), but I think Torches don't always react well to that.