The stress of being moved around and the ammonia could have played a role. keep in mind how many times these poor fish are moved.....from the ocean to your tank there are probably 4-6 stops at least.
Sometimes there really is no answer for sure, and it sucks but that's kinda how it goes. :-(
Just get that ammonia down and stable and then you can try again. Do you have a qt tank? You can qt the fish in there for a few weeks and be able to tell if somethings not right.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.