I have had this fish in QT for roughly a month. I have not been treating with anything because besides this no other problems were present. I received both fish I currently have in QT directly from the wholesaler. One is a blue throat trigger and the problem fish is pink tailed trigger. Now I have never had either one of these before. So I am a little unsure of their color changing abilities and have a hunch that this may be what I am seeing. I want to make 100% sure though. The splotches shown below are not fuzzy and look like normal skin of the fish. His eating pattern has not changed and besides the discoloring nothing seems to be wrong. The other fish in QT is showing no signs of anything. I have had issues keeping my ammonia below .05 (QT just wont cycle properly, been using Kent, Pro Ammonia: Detox to keep it under somewhat control) but it has never been higher than that. Has anyone seen this before? Is it a disease or just a color change? Should I start a treatment of some type and if I do, do I need to drain the tank due to all the ammonia detox I have been using? Thanks for any help or knowledge you can pass on. I have been in salt water for over 9 years and I still feel like I know nothing about it... every day you learn something knew in this hobby it seems.