I too, am fond of the Bangaii look. I ordered one from swf.com and it arrived in great shape. Three days later bought 2 more from a lfs that were the same size. All three schooled together for the first few hours. I woke up next morning to find one of them dead. Nine hours later after work, I found another dead. Next morning the third one was dead. It is a 120 with a bit over 75 lbs of LR and 100 lbs of sand with 50+ lbs of live sand on top. I have a bunch of hermits, astria snails, emerald crab, feather dusters, 2 baby conch, lettuce nudibranch, arrow crab, 2 pep shrimp. Everything else is fine....
I am now aware that I should have learned more about this specific fish and its living requirements. I just see them for sale in groups of 10-20 in a tank at a time.
I will not be adding anything to this tank for a while. I will do my normal routine of water changes for a few months, then try again with the Bangaii.