Need some advice here. The last couple days my 5-6' female Thalassoma lutescens has been acting weirdly. The first day i added it to my tank, about 6 days ago it got harassed by my T.quinquevittatum and T.nigrofasciatum and hid for most of the day in a cave. When i removed those 2 fish it came out and instantly seemed at home, it was eating well, swimming around comfortably and actively and got along with the rest of the fish aside from occasionally chasing the smaller wrasses away from the masstick i have recently been trying.
I also then removed my six bar angel which was really the last aggressive fish in the tank and everything seemed really good. I then treated the tank with prazipro as there's been a minor fluke problem in the tank that never seems to go away despite pretty much weekly prazi doses. I dose 1.5x the reccomended dose, leave it for 12-24 hours and then put my UV on, then the next day my skimmer back on. It's a risk leaving the UV off longer because my maculosus angel and declivis butterfly get a few spots at that point. I don't see any of the major symptoms like cloudy eyes, but even a couple days after the treatment my fish start flashing against rocks again. Maybe it's not flukes or the flukes are immune to prazi.
Anyway, when i dosed prazi the lutescens started hiding but came out the next morning and ate, but then hid again. But even after the UV and skimmer were put back on and the prazi should've been gone, it has been hiding most of the day and not really eating. It occasionally comes out but only when another fish enters the cave and it leaves. It'll eat a bit of mysis or whatever and either go back to hiding, or it'll swim directly in front of my powerhead for a few minutes but not around the rest of the tank. There's no bullying whatsoever aside from my sailfin occasionally chasing my declivis or between the maculosus and sailfin. This morning it was hiding in some rocks in the central part of the tank instead of the usual cave, it's head was poking out. I added some pellets and all the other fish started eating but he wouldn't budge. Physically it looks perfect, no torn fins, good colouration, bright eyes, even a little fat and it might be starting to transition since i can see a tinge of green coming through on the body.
I'm really worried since i had another male T.nigrofasciatum about a month ago. I added it to the tank and it hid for a few hours, then came out later that day to swim around and eat. Everything was going well but i didn't see it the next day. Then the day after that i found it just dead in a cave. Zero marks, zero injuries and there was no bullying at all. Just dead. And i'm really worried something like that is going to happen again.
Should i just leave it and hope it comes right?
Here's a photo of it this morning: