I'd take a real hard look for Nudi's .. they can camouflage extremely well.
Also, as Connie suggested.. sundial snails will consume zoanthids. Best to take a good look at night with the lights out ..
Good luck.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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