Thanks for your replay and link Anthony, and thanks for the rest of you.
The Valonia I have had in my aquariums looks like grapes, they are green and very shiny, somethimes with a brown-dark red over them but never seen so big as this blue thing. They were ever patched in live rocks and never was attractive to crabs. I want to say too, that is a little hard to take them out of the rock.
In the link you can see the Valonia looks as shiny as a grape and under the picture I can read the following translated from french:
ressemble à du marbre vert avec une lueur réfléchissante lumineuse....
resemble green marble with a luminous reflective gleam...
It is too big for an egg, layed from species I have,,,,, I haven´t seen birds inside the aquarium,,, just kidding, only a big Condylactis gigantea, but I don´t believe this thing came from the anemone and from ´´Star Trek´´, as someone thinks, either.
Thanks again for your help.
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