Hi Even after increasing CO2 until the drop checker turned a yellow/green colour BBA remained an issue in my 325 ltr tank. So I have been adding Flourish Excel at twice the daily recommended dose for about a week now. Certainly the BBA is in decline but the Vallis plants, particularly the twisted variety are looking very jaded indeed. I'm not sure if this is caused by the Excel or by the increased PH - now 6.3 according to the control. Does anyone have any experience of this or know if I am adding too much Excel?