Keep an eye on it. Nudibranchs are predatory and typically only feed on one or two things, and its usually something expensive. If it's surviving in your tank it's eating something... just firgure out what. Also, they can spawn asexually... so if it is bad you can end up with a lot of them real quick and they'll do some damage.
That being said, enjoy it. They are my favourite sea creatures! Some of the cool looking nudi's are hard to keep alive, so if he's surviving (and not destroying something) take care of him!
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