Newly opened pink flowers turning... purple?
I purchased this AV at a local BBS about a month ago. It was in bloom when I purchased it. It's blooming again, but I've noticed something odd going on.
They started opening yesterday, but have yet to fully open. They have stayed in a semi-cupped state. I just noticed today that the edges of a couple flower petals are turning purple and the unopened buds are also turning from pink to purple.
What could be causing this? Should I be worried? Is this a bad thing/is this normal?
I did fertilize a couple weeks ago with fish emulsion (that's the only thing I could think of that might be having an effect on the flowers, if even that's possible). Nothing environment wise has changed.
A picture soon after purchase:
Today: If you look close enough, you can see the buds are a dark purple. They were pink yesterday. Excuse my extremely dry thumb, it appears I need to put some hand lotion on!
This one's blurry, but another today picture. You can sort of see the back of the second bloom that's beginning to turn purple and the buds again that are purple: