Im going through the same thing but my LR
is about 2 years old. I had to switch tanks due to a leak and my LR
turned from pink and purple to white. It has been 3 months now and is just now kinda starting to get some of the color back.
I have found a product that seems to work. I have been using it for less than a week and have noticed that coraline is starting to grow again and the pink and purple is coming back. Its called Kent Liquid Reactor. Give yours a bit and see what happens...might be your lighting as well...to much or to little....either way the color will come back in time.