sorry for the late response or less than detailed post. I was typing on my phone. I sell these Kessils and have them on 2 tanks 28G Nanocube and a 2x2x1 Frag tank area. Currently I've been testing the Nano with just Acans, Chalice, SPS- Leng Sy Cap and Zoas. The best results so far is Zoas/Palys they are open and liking the shimmer, For Acans They seem to be stretching for more light. *No Aquascaping/rock work...everything is on my bottom sand bed* I would place the acans about 6 to 8 inches above sand bed and they should be fine. For chalice I just have a couple of Enchino types and they are holding color. The Leng Sy Frag browned out and definately needs more lighting...I haven't moved it up, but I would place them 4-6 inches from the top but there is no garauntee.
My 2x2x1 Area in my frag tank is all LPS including Frogspawns, torches, lobos, favias they all seem to do well, as far as growth it is definately noticeable on both tanks...*not much* The colors pop for sure, but if you are looking for growth I would look into a different light. Rephrase that my zoas and palys seem to get average growth.