What are those hitch hikers and those mushrooms?

[namlessdude]

So i bought a bunch of livestock from a guy shutting down his tank. He gave me a bunch of rocks from his tank, some corals, and a lot of snails. Anyways, i got this mushroom looking coral that is very hard and I don't know what it is. Also, his rocks have these dark green things that look like soggy bags (picture 1 and 2, i point at it). The rocks also have these red nails like things that are hard and can poke you or break off. What are those things? Should I simply wash the rocks down with vinegar and then hot water to be safe or are those ok?

 

[robertmosen]

I have millions of them. They are filterfeeders.

Only problem i have with them is that they grow inside PVC-pipes, skimmer and such. Not a big issue but a bit hard to remove (cut my fingers a couple of times).

 

[namlessdude]

I have millions of them. They are filterfeeders.

Only problem i have with them is that they grow inside PVC-pipes, skimmer and such. Not a big issue but a bit hard to remove (cut my fingers a couple of times).

Someone said it's vermetid snails. Do you think so?

 

[robertmosen]

Yes, that’s what tey’re called.