I've never kept one so I can't comment from experience. There is a wealth of info on them here though. I'd suggest a search using the feature above for "blue linkia" and see what you find.
I would add though that my understanding is they can be problamatic...they need to be properly acclamated to a stable/mature system that will be able to provide a food source.
A few members here have them and I'm sure they'll be along to help you gather info on your recent addition.
One last thing...its normally best to research and gain critical knowledge prior to adding a marine creature. Best of luck...
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