I have no idea what this is...it is VERY active (seems to be enjoying the space), water is VERY new (6 days new).
Can anyone help
Thank you, just goggled it and yes that's what it is.
Do you think it well survive in my new water???
Lava rock is quite suitable for marine tanks... the entire Hawaiian islands (and the base of the vast reefs found there) are volcanic in origin.
About the Bristleworm, don't worry about him surviving, they can survive nuclear attacks.
By the way, don't touch him.
-Lynden
Just FYI, That is "lava rock" but in no way did it even remotely come from a volcano in all probability, in the US its made synthetically (and since it looks exactly the same as the stuff that I've seen in photos from the UK its a safew bet that its the same there) and generally impregnated with things that you do not want to have in your saltwater tank, things like pesticides and herbicides and heavy metal dies.
I agree, lava rock is not worth the risk