Hi Guys, My large tanks coming along slowly but one thing i've always had problems with is the old leafs. On spem plants a lof of them start to look tired and its only the very new growth which makes them look half decent. I'm at a pretty good level of CO2 and have been dosing easycarbo as well but this doesnt seem to have had any impact. It appears to a slight brownness at leaf edges which i'm thinking is diatoms and perhaps coupled with a small amount of greenspot. Anyone got any ideas?