gosh....that Sebae reminds me of my past Sebae.
Mine looked as just the same one you just got there.
And in case you didn't know, your Sebae is bleached. Sorry but I have to inform you that bad news cuz I've been there, done that. That's not a good thing.
You will have to give triple amount of efforts on it to bring it back to live.
Bring it as close to your MH as possible and feed it every day with a small pc of meaty food.
Mine gave up on me after 1.5 mons. That was my beginner mistake. I didn't read about bleached anemones before I got it. It looks cool when it's bleached thou. But That's not how a healthy Seabae is supposed to be.
If you want to know how a healthy Sebae's supposed to be. Check out my thread in the "Fish Photography" section called, "invasion", that's my new Sebae and it sure is healthy.
good luck and don't forget to keep us posted on the conditions of your sebae.