First, I would not suggest a potters as your first angel.
I keep a lemonpeel, I have seen it nip at an SPS once. And that was the end of it. IME it is always a 50/50 toss up with any Centropyge. I have had a CB, Lemonpeel, and a Flame.
Also, keeping them well fed as said above is a good thing. IME this has kept my angel's from nipping. And I have one notorious for nipping.
I always have a sheet of seaweed on a rock and I feed mysis once a day.
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Livestock: A. Ocellaris Mated Pair, Six Line Wrasse, Lemonpeel Angel, Fiji Golden Sailfin Blenny, Purple Firefish Mated Pair.
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