That does not look like black ick to me. It looks like your clowns have been rubbing up in something (a coral) and it's giving them the spots. My clowns have this as well, the rub up on LPS corals like Frogspawns...
Do yours do this?
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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