What is this thing in the picture? Looks like there are multiple white tentacle with black spots coming out of the rock. It's been there since I put the rock in the tank a week ago. Any ideas?...
That would be my guess also. They hitchike on the rocks. If you have a couple you probably have a ton of them. They are already full size. Get a flashlight and check it out at night. You may see all kinds of fun things.
are they tentacles or are they hard calcium tubes with tentacles coming out of them? if hard tubes, polycheat worms. (feather dustes)
if tentacles, then i dont know?
They're fine. It almost looked a little like crab legs, but if you say they flex, they're likelier something like a harlequin brittle star. Green brittle stars are bad news. The black and white banded are nicer.
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