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I agree the Koralias are excellent for increasing the flow around a tank. I have one so in my 180l tank so the flow (including the filter) is just over 10 times the volume.
However I agree with the others that BBA is most often linked to CO2 so unless your circulation is so poor that the CO2 rich water isn't getting circulated well enough I'd look at CO2 levels first.
However I agree with the others that BBA is most often linked to CO2 so unless your circulation is so poor that the CO2 rich water isn't getting circulated well enough I'd look at CO2 levels first.
