ok my tank has been up and runnin for over a year now its 10g 60watt pressurized co2, i dose 5 diff ferts. anyway my downoi are turnin a liter green on the bottem leafs and fallin off. The first pic is what it looks like up close. The other pic is all the downoi you can see the ones that are goin to fall off. Any clues on why its doin this?