I have had some success with a couple of anemones, both nursing them back from bad health and getting them to move where I want them. I don't know if yours is a green bubble or not, but regardless I agree it looks bleached. If he is still hanging upside down he may stay there, but I doubt it and he may move behind your rock where you can't see him. As far as getting him to move this is not impossible and it is possible to get him to go where you want, provided the flow and lighting and environment is right. Best case scenario is medium or changing flow, but not strong. A medium sized opening so he can plant/wedge his foot in a shaded area, but to where when he is open he can get into the light. The key is no sand. Many may disagree, but anemones dislike sand and prefer rock. In fact sand will help you move him. If he is still hanging I would find a couple small flat rocks. Set 1 behind, blocking the opening to the back so that he can move down it and 1 directly below him. Normally they like to move foot down, but can move horizontally as well. Caution if he starts to move, never ever help move him unless he is comlpetely attached to the rock you are moving or completely detached from everything or you will damage his foot and could kill him. If he attaches to a rock that you can move it to the area you have created for him, set it down in front of it and build sand around the rock so that he doesn't move in another direction. Gently tilt the rock in the direction you want him to go. Tipping it a little more each day. In a perfect setting you want to end up with rock behind him, on at least 1 side and beneath him. Both anemones below were attached to rocks when I brought them into the tank and I got them both to move exactly where I wanted them and where they are now.
Block his passage so you don't lose him behind the rocks, then work on getting him happy and healthy. Hopefully before he moves, but you can do it while he is moving as well.
Here is what I do and as you can see my anemones both look pretty healthy. Get some bamboo skewers from the grocery store. They come in packs of like 100 for $2.00. Depending on how deep your tank is you may have to tape 2 together. Buy a package of 50 count boiled and peeled small shrimp. It doesn't matter that they are cooked already and they stay on the skewers better than fresh. Just make sure they're not seasoned. Take one and microwave it for 10-12 seconds to thaw it out. Then run it under cold water to make sure its not hot. Since your anemone looks smaller, cut the shrimp into maybe 1/4 pieces. You will have some waste as he won't eat a whole shrimp in 1 setting (ever). Gently put 1 peice on the end of the skewer. It may take a couple tries to get it on where it will come off when you want it to and won't fall off when you put it in the tank. Put the shrimp about half way between the center (mouth) and the edge of the anemone. Provided you don't have it on to tight he will take it away from you and do the rest of the work himself. At the stage you are at I would do 2 pieces 2-3 times a week. As he gets his color maybe go to twice a week. You CANNOT over feed an anemone. They will either not take it from you, eat it and spit it back out or digest it and poop it out their mouth (sorry but that's what they do). If you have clowns watch and make sure you anemone eats the shrimp as they will steal it and leave it lying on the sand. I guess thats why they call them clowns. White anemones are very rare and nearly always have color, even though many stores will sell them as white. The Sebae on the left was a 3 inch Ivory colored ball when I got him 9 months ago and he is more brown than and tan now is probably 8 inches across. The green bubble on the right had his mouth wide open when I got him (not a good thing) and maybe 4-5 inches across. When he is active he is nearly a foot wide and Ive had him about 5 months. Sorry so long winded...hope this helps