BTA drastically changing color after 6 month. What's going on?

[Subnautica]

When I first got it

6 months later, the nem split, but colors changed from beautiful bright pink to dark red/orange

 

[reefz]

Looks normal to me. Not unusual for a nem to change colors in a new system. Most likely the chemistry in its previous tank was different then yours. As long as it doesn’t start to shrivel up, or brown out, It’s healthy

 

[Randy Holmes-Farley Verified Community Expert]

It's probably a response to lighting and/or nutrient levels, which can alter zooxanthellae levels (they are a golden brown) or pigments in the anemone itself to protect it from light damage.