Help with Red Bubble Tip please!

I am needing advice about my red bubble tip anemone. I have had it for about 10 weeks and it has been doing great. I feed it silver side pieces twice weekly and it eats readily. It has grown quite a bit since I purchased it, has always had great color, and I have never had any issues with it. In the last 10 days, it has started hosting a pair of blood orange clowns. They spend about 50% of their time with the anemone and about 50% away from it. Everything has been great until tonight. I came home to find one side of the anemone shriveled and looking blackish green. I tried attaching a photo, hopefully it will load with this post. Can anyone give me any advice about what might be going on? My water parameters are spot on and I did a water change the week before last. I have it in a 190 gallon tank with a yellow tang, a fox face lo, 3 fire fish, 2 blood orange clowns, 2 maroon clowns, a lawnmower blenny, a scooter blenny, and an engineer goby. Any advice would be greatly appreciated!

Edit: Now it has completely closed itself up and has slightly withdrawn back into the rock it is attached to.

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