What are these white things.

[Treenk]

So I never turn my light on at night but today I decide to. And I see all these white things on like half of my coral. They seem to be opening up just fine despite them being there hints why I never noticed them. There are a lot of these things what do I do

Also there is this brown thing on the back of my duncan it had a bubble on top I took it out to look at it and it just flattened.

 

[BayouReefer]

The white things are pineapple sponge good guys. The bubble appeared to be bubble algae “Very bad guy” when popped if spores get into tank will spread.

 

[Treenk]

So these wont smother the corals one is between a 2-3 head polyp. And I may have accidentally popped it while pulling the frag out to look closer. Should I dip it? It's the only what I assume is dino bubble I have seen.

 

[BayouReefer]

If it is bubble algae and it has not been popped the best thing to do is remove that frag and without popping the bubble take a pair of bone cutters and cut that piece off and throw it away.