What is on my rock?

[Keeks09]

Can somebody tell me whatthese are growing on my rock and if they are safe?
The first one looks like a milky cobweb that easily comes off when touched.
Rhe sexond one looks like a dandelion or an antena with a ball at the end.
And is this yellow stuff algae?

 

[Highgrade]

First pic appears to be a dead coral of some sort- Favia,Acan,etc... Most likely rotting tissue. I'd pull I out. if its decomposing its not helping your parameters. The other pics of the yellow appears to be algae of some sort or possibly sponges. Most likely Algae though.

 

[Keeks09]

First pic appears to be a dead coral of some sort- Favia,Acan,etc... Most likely rotting tissue. I'd pull I out. if its decomposing its not helping your parameters. The other pics of the yellow appears to be algae of some sort or possibly sponges. Most likely Algae though.

What should i do with it? Put it in a quarantine tank? I forgot to mention my tank was started 8/5/17 and that rock was added 8/12/17

 

[Highgrade]

What should i do with it? Put it in a quarantine tank? I forgot to mention my tank was started 8/5/17 and that rock was added 8/12/17

I'd toss the decomposing coral. As for the rock with the yellow I'd keep an eye on it.

 

[Bob The Reefer]

Anyone offer an opinion as to what the egg white looking stuff is?

 

[ajcanale]

Pretty sure what we are seeing in the last image is yellow sponges, which are very common, but usually grow on the underside of rocks.

 

[ajcanale]

Anyone offer an opinion as to what the egg white looking stuff is?

Pineapple sponge for sure