What do sponges look like?

Along with my feather dusters, I also have these purple/red things sprouting up all over the place. They are mostly composed of one column with slight stubby like branches, it looks like cotton rolled together. I should have a pic by tomorrow, but do they sound like sponges to anyone?

 

Could be sponges or a type of forameriferans. A pic will help make a positive ID though

 

sponge or Tunicates(ASCIDIAN) is my guess!

 

2+ to that. i have red sponges, blue sponges and the traditional yellow sponges, all have a different textures and shapes. all are beneficial i feel, but if they do die then they could polute the water.

 

Finally I have my Pictures, So what the $%&$%^#% are these two things?

 

Sorry I uploaded it wrong, what is this one- The first picture does not do much but just sit there. the second one does not go in at night, and it goes in when easily startled.

 

second pic is a feather duster worm. those are good. the red under and to the left look to be red sponges! thats good!

 

Thanks for the info, do you think the feather duster will spread? in the middle of the second pic is a red blurr, Im sure it is a sponge though.... Thanks I was wondering what these things were.. Sounds like i got some good stuff growing on my lr

 

sound good! and good to see! that means you are well on your way to a good looking tank. looking at the red stuff again in the second tank, it looks like it may be coralites, they are harmless pinkish red growths on the rock. ill get some more info for you!