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There is no such thing as a white sebea... It is a sebea that has lost some of its zoo algea. Proper feeding and lighting will bring back its natural brown color. Try to soak the silverside in selcon or vita chem...
The 10000K and 6400k lights (PC) come on around 9:30. At that time, the anemone was more white in color. Now, around 10:00, most of the tentacles are brown while a few which are under a rock ledge remain white. (At all times the tentacles maintain their purple tips).
Additionally, the anemone shifts it's position throughout the day. At times it pulls itself into it's crevice, at others, it stretches out and tilts toward the light. (as if it were sunning itself)
I did not describe all this as I was not concerned for the health of the anemone, only its location.
However, since the anemone has moved, I have noticed the brown color is stronger that it was before. I assumed that this was due to the stress of moving and that eventually it would return to the lighter brown it had been. (It originally situated itself at the bottom of the tank, it is now about halfway up - 120g, 24" tall.) But, as you're pointing out, the deeper color is most likely due it's closeness to the lights.
I still think it's healthy, mostly because of how much it has grown since I've gotten it and, other than the past two days, it has not moved since it was placed in the tank over 3 months ago.
However, I did think the brown color was a sign of stress, not health.
Sebea are supposed to have a naturally brownish tint to them. Some have bleached compleltely clear and grown back their zoo algea. If its growing then it must be healthy but pump your food full of vitamens....
Congrsats and one thing i learned dont move the anemone move the coral... Moving an anem can result in injury.
Congrats the sebae sounds like it's making a come back. As the zooanthelle algae repopulate the anemone it will move higher up in tank for more light and closer to the return for more flow. I wouldn't try to move the anemone it because it's going to go back to where it needs to be to survive. Like ReeferNets suggested move the corals because their easier to move and more adaptable in an aquarium.