Clear things on my SPS. Hydroids?

I_Got_Crabs

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They seem to be two different types. One looks almost like pineapple sponges but completely translucent. Are they hydroids? Good or bad? What can I do?
20190308_192305.jpeg
20190308_192431.jpeg
 

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They seem to be two different types. One looks almost like pineapple sponges but completely translucent. Are they hydroids? Good or bad? What can I do?
20190308_192305.jpeg
20190308_192431.jpeg

The second pic is definitly hydroids. Just quit feeding them and they will go away.

The first pic is hard to tell. Almost shaped like tunicates or sponges...... but also look like bubble algae shells.
 

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