Dry rock organisms

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Good day guys!

So I am wondering if you guys had the same experience with dry rocks. This is my first time buying dry rock because I usually take the live rock side. I wanted to fill my tank with more rocks so i took a shot with dry rocks. After 3 days of my dry rocks in a 5 gallon bucket with rodi water with a power head I saw this (dead organism?) attached to the rock and i peeled it off pretty easily. The texture felt hallow but it looks weird to me nevertheless and was wondering if you guys have experienced this with your dry rocks.

 

[lapin]

I have found stuff on dry marco rock. Mostly tube worm tubes.

 

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I have found stuff on dry marco rock. Mostly tube worm tubes.

Is it dangerous? Should i be worried if i place this in my main display tank?

 

[lapin]

If the rock has been out of the water for a year then everything you see is dead.