Bubble Coral Dying ?

[Javy]

So I recently walked into a fish store. And seen that nice look bubble coral. Was awesome and fell in love with it. I bought it brought him home and place him into the tank. For the first week. He was awesome. Looked just like he did when I bought him from the store. Then all of a sudden I woke up one morning looked into the tank and he now looks like the pic below. Everything else in my tank is fine. I bring my water into the LFS to have everything checked every week. And everything always comes back good. I do weekly 20% water changes. And I have him sitting right below my wave makers. So he is not in direct movement of the water flow. Can anyone tell me why he looks like this ? Or how to fix it. I've read all over and cannot find a bubble coral that even relates to how he looks.

 

[Javy]

My Bubble Coral

 

[Cnidoblast]

Bubble corals will bounce bak over time keep the calcium stable and it should fair okay

 

[Javy]

Thanks for the video. I still don't see what I'm doing wrong, or why he is not coming out.

 

[reef lover]

Do u have a sheltered place to put him maybe under a ledge...they like low light and need almost no flow to thrive.