I'm not a professional when it comes to cherubs. What I do know is these are the most reef safe compared to other pygmy angels. I was nervous at first too but after obsessively monitoring this fish, he only goes for algae growing on the rocks. I've seen my cherub swim up to my acros and stylos just looking but no biting. Mine does occasionally nip at the stem of my toadstool leather. However, I think it's because of phyto and some other algaes. No noticeable damage. Oh BTW they need plant based foods supplemented with normal feedings. Nori or spirulina algae is what I use.