Well, tomorrow I'm going to paddle out in my canoe and take some close-up pix of the chara in my pond ... I've been putting off hauling it in too long now-- I keep on hoping it will sink!
From what I've observed, when chara grows to the very surface it emerges and "sun burns" -- turns white. Then, I have noted on several occasions that filamentous algae will become attached, almost like it's colonizing on it.
When that has happened (the FA build up) over the past couple years, I've used a powdered hydrogen peroxide product that really works well on the FA -- literally dissolves the stuff. The chara? Unscathed, of course! -- Mike
