I just did my weekly 50% w/c on my 90 gallon. Right after the change I noticed that my largest blood parrot had changed from a brilliant orange to almost pink or pale apricot. this happened within minutes of the water change.

Should I be concerned? This has never happened before. The water temp matched, and I used 3 capfuls of Prime which equals 1 1/2 dose. ph from tap and tank are the same

This happened about 30 minutes ago and the BP has not reverted back to it's normal color. Anyone have a clue what's going on?
thanks