I agree. Most angels need to be alone, fighting can and will ensue if you attempt to house more than one species together. Also, I see you said "75 Gallon Reef". Be cautious with your angels. Most are not 100% reef safe and will nip corals and clam mantles.
About the clown, some can do it and some cannot. I think it depends on the individual aggressiveness of your clowns. If you are sure that you have a true pair, I would say no.
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