ID- what is this?

[vypre]

I have no clue what these things are. Any help will be appreciated.
https://imgur.com/a/pyDVa
https://imgur.com/EkD2BsU
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[Animagus]

Some type of sponge would be my guess.

 

[C.Eymann]

1. Rhodactus sp. - mushroom coral

2. +1 to Animagus, sponge = good

 

[vypre]

Oh wow didn't know that. Thanks for the info guys

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[mzeme565]

not sure