Live rock - Black Parts

Tjured

New member
Hello,

im totally fresh to Sea Water Aquariums, started mine last Week, read alot and finally felt secure enough to try, i had normal Aquarium for 2 years now, always been fascinated by Sea Water Aquariums.
My question, my Live Rock seems to have Black Parts, there was a Web like thing and when i rubbed that away with a clean toothbrush this was left.
here are some screens, should i just not worry is this normal?
i mean otherwise the rock is beatiful, expect this black parts
 

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It is actually a Liver sponge. I had one grow quite large:
053.jpg


Nothing to worry about, just one of the many lifeforms that live in our tanks.
 
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