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Originally Posted by OCDP
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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Mine bubbles sometimes under my 2x96w PC's, and I'll find out this afternoon what it does under 4x39W T5's.