What Is This???????

[Saltygirl2012]

The brown on the rock to the right of the fish. Not sure if it is coral or something else!









What is the red on the rock? With flake off the top but then still some left and will not come off!


Thanks for your help!

 

[bettaowner]

It looks like a coral of some sort.

 

[Rutrag]

The first pic looks like a type of colonial feather duster I have in my tank. Does it all retract if you touch it?

I'm not sure on the second pic. The way you describe it sounds like a type of algae, but I can't really see from the photo.