ID marine growth

[xnsdvd]

Would really appreciate it if someone could take a look at these photos and tell me:

1) What they are

2) If they're the kind of growth you want on live rocks.

Can you spot the brittlestar?

And finally, what the hell is this thing?!

Thoughts/Comments/Ideas please?

[yikai]

extremely good quality and sharp photos. all the above except the last photo looks like sponges and are ok.

not sure what the last one is.

[cdckjn]

I agree. Most of the pictures show sponges growth. The last picture could be some "corals" but I am not sure what it is.

[xnsdvd]

Many thanks for the advice guys, So would sponges on Live Rocks be a bonus or detrimental to their price? Personally I've only dealt with FOWLR tanks so sponges were a nice splash of colour for me. Not sure about reefers though

Also, if you look carefully, the colourful things coming out of those black tubes are worms of some sort. Can anyone ID it? There's a few in the 2nd last shot, just above/around the sea fan.