As much as it would be awesome if it were purple, i bet it is just a regular tan/slightly purple Mag like is seen frequently. Blue led just messing with the white balance of the camera. i saw some gorgeous, colorful mags diving once, but they just don't seem to get in the hobby. Maybe they bleach or something.
You know anemones better than anyone and I bet your instinct is right.
FJW got in some African Mags this week i am going to check out. Dennis said some have purple or maybe even red base, so worth a look. Regular colored tentacles.
Good luck!
Mark