In the past few weeks a weird black thing has shown up in my tank attached to a piece of rock. It appears to be slowly getting larger, but doesn't move... kind of like a round bead of shiny black tar.
In my 55-Gallon tank I have a Yellow Tang, 2
Ocellaris Clowns, a
Scooter Blenny, a Red Shrimp with a white stripe (I think it is a Skunk Shrimp), a Butterfly Fish and Brain Colral (both added after the black thing arrived), numerous snails and Hermit Crabs, and I recently found that I have some rather large worms (at least 4) as well as some small pinkish bristle worms.
Should I try to remove the black thing? And, should I be concerned by the worms?
Thanks for any help, I'm going to try to share a photo of the black thing.
The white bit on the black thing is reflection from my camera's flash.
