No actual experience, but I seem to recall Tom and others claim that excess CO2 has limited, if any, extra value. I don't recall reading anything about getting to grossly excessive levels causing problems, but I sense there is just a diminishing returns on the benefits.
My thoughts,
Brian.
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46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member
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