If you have sufficient surface agitation it should provide good oxygen exchange. I don't think an air stone would be neccessary, but if you feel you need one, it wouldn't hurt to run one for an hour or so..
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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