i know how sensitive they are too. i had a marineland heater blow up on my sump. and my first pair, which was larger and from ibluewater also died, as well as some other fish. the female was about 6" and vibrant like my current pair. they got super stressed and died the next night.
if you have them in a nem, they will most likely keep their brigher colors and not turn so dark brown. i have my tricinctus in a rbta