You can have both. It would be best to get the anemone first so it can find a place where it is confortable and won't move stinging corals.
Also, for an anemone you need to have a mature tank, probably like 6 months atleast.
I put one in a 2 month old tank once, it was there for 4 months and never had a problem. But it is best to wait and let the tank mature.
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Mario
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