FWIW, under my PC's on my 20g tank (2x65w) I used to see some bubble tips on my RBTA... I have since switched to MH (150w HQI) and I haven't seen any bubble tips since ...
like I said, FWIW !
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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