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Yesterday I did a normal water change and today I was looking around the aquarium and saw this little guy. I'd say he's a little under a half an inch long. No idea where he came from nor what he is. Lastly, I have a 12g nano cube.
That's a nudibranch may of which eat zoas and polyps and it is often the same color as its food. Do you have any zoas that color that you've recently purchased?