soft coral disease

I’ve been monitoring this mushroom for about a month ive notice the top of it was turning white and I figured it was because it was bumping up against the gsp, even though im not fimilar with gsp having stinging abilities, fast forward to today its now definitely receding, i have another one on...

Hi, I was just wondering whether this Kenya tree and devils hand have some kind of tissue disease or a possible pest is in this tank. They have said that there is no pests or worms they’ve noticeable except some bristle worms. But they aren’t sure what to do. Whether the dead areas if they are...