Fuzzy white bubbles growing in corals, Help!

[Berrycurtis]

The other day my one fish died and I have this weird fuzzy bubbles growing In my zoos and a couple other corals. I tested my water and cleaned and replaced all filters everything checks out. Any ideas what these bubbles are? Any coral close to these bubbles are dying. HELP

 

[Aquarian]

The Zoas look like they are just closed. And I can't see the gsp clearly. What are your tank perimeters?

 

[Sakura2282]

Maybe they are sponges, but it would help a lot if you can post your parameters and more pictures.