Nope, not all flowerhorn peel. Some stay permanent at what your seeing, some peel. And it peels when you see the fish is darker and slowly seeing different color changes.
If that red is starting to turn into maroon color. It might peel...if not, no chance. But if it did peel at a red color, it's going to turn scarlet or lighter than scarlet.
If that red is starting to turn into maroon color. It might peel...if not, no chance. But if it did peel at a red color, it's going to turn scarlet or lighter than scarlet.