I've got an SPS dominated tank with 2 dwarfs. 1 Coral Beauty and 1 Rusty Angel. They've both been great. I see then nip algae all day, but never an SPS coral or clam. I've had my Dejardini sailfin eat clams before, but the angels won't even look twice at a clam. They don't really directly attack nori either, just eat whatever is on rocks or floating around.
Again, I've got more problems between my Dejardini (who I keep because he eats ALL ALGAE! including bubble, GHA, bryopsis, etc) and my Christmas Wrasse who eats snails, so i don't really worry about the two dwarfs.
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