Just finished moving the aquarium to our new home.
Found this stuck to the glass. It doesn't appear to have moved in the past week, however it does appear to be growing. It's currently about the size of a raisin. It's like a tiny porcupine with what look like filaments coming off the back side.
I thought it might be a nudibranch, just doesn't quite look the same though.
Any ideas?
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