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strange stalk on coral, help with ID?

PostPosted: Mon 22 Apr, 2019 6:35 pm
by errand
I'm extremely new, I have bought 3 corals from my lfs and one of them has a strange stalk on it. It was there when I bought it but after researching I can't work out what it is, or how to describe it to google in order to get the result I need, here is a picture:

It doesn't seem to be part of the coral although it looks like it's attached to it. Does anyone know?