Pinktail Triggerfish - Changing colour before our eyes

GeordieCat

New member
We have a Pinktail Trigger. We have had it about 3 months, been fine until today. We have introduced a Bicolour Angel into the tank 24 hours ago. They are swimming side by side with no aggressive behavior, however the Trigger is changing his coloring from pale ghost white to a shade of yellow then back to his normal green/grey. He is doing it over and over again and you can see him change before you over about a 10 second period. He is not putting up his spike and is eating and swimming well.

Does anyone know why he is doing this odd colour change and why? Could it be stress due to the new Bicolour Angel?

We have done a water change in the past 48 hours and also changed some of the live rock adding a platform under the live rock. It's really bizarre to watch and I can't find anything on the web about it.
 
Welcome! It's probably just territorial thing, if possible try moving a couple of rocks around in your tank..
 
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