This is one of the most dramatic color changing fish I've seen in my life. All my triggers changed colors to some degree, I think my goldheart was the most variance but this undulated beats even it.
This is a picture of normal color when he is just cruising the tank... no flash used.
I bought two fire shrimp and some live rock rubble for them to reside in and hopefully get a little bit of a pod population going... and I was HOPING they would clean the trigger. I know I've seen him scratching and I know he definitely has ich since he was in Petco water for 5 months. Cleaner shrimp cant get rid of ich but I was hoping they could help with the itch.
Long story short, as soon as he saw them he came over and turned insanely dark and spread all his fins and was laying there trying to get cleaned. The shrimp had only been in the water 5 minutes so they were still just getting adjusted, but after he begged for about 2 hours they started cleaning him. Anyway, his color was just amazing during this cleaning period. Super dark and purplish, I wish he looked this way all the time.
Begging...
Still begging...
More begging...
And then finally, success!!! I wish he wasnt in the far back corner of the tank in the dark, I couldnt get a good clear shot.
And then here, I wanted to get a picture of his dorsal spine since he was stopped and displaying it so nicely.
Anyway, what a gorgeous fish. I love this guy and I'm so happy he is using the fire shrimp as cleaners and not appetizers.