Don't have a clear idea based on the pics, but I will just add a personal anecdote about Bluethroat triggers from my experience quarantining them. I do a lot of batch quarantines for customers where I'll bring in 10 or 15 fish they desire to have stocked in their tanks and perform a full qt on them before adding them as a group. This has worked very well for me in terms of creating stable, low aggression tank mixes. I have a fairly high success rate with all fish through my standard qt, but bluethroats seem to be more prone to death spirals and symptoms that I would attribute to cyanide catch than any other fish species I frequently QT. I mean I'll have one in a tank with a set of fish for 2 weeks in medication and he'll be eating like a champ, showing no stress after freshwater dips. And then one day I'll walk in and see it trying to swim with no avail and flailing about the tank before laying on the bottom and dying - usually less than a day later. All other fish in these cases show now symptoms and coast through the QT just fine and have no disease in the customer tank. So I end up frequently having to tell ppl, they'll need to wait till I get a bluethroat that lasts. It's hit or miss for me and I have access to the main U.S. fish importers in person and often select my fish by hand. I wouldn't beat yourself up about the trigger too much so long as you're follwing good QT protocols and having success with other fishes.
