I'm no expert, but mandarin and clowns are going to be like lionfish food for him depending on the size. I am not sure if it would eat a Mandarin? (I dont see why it wouldn't) ... but if your clowns are tiny, they are most likely going to become a snack. Just my thoughts, wait for Danny to chime in, he has a dwarf.
HTH
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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