Bill --
I will do that tomorrow. Right now we're getting a good (and much-needed) rain. It's been a long, dry summer -- probably another reason the chara flourished the way it did.
On the topic of dissolved oxygen, I wonder how chara ranks as an O2 producer in bright daylight, compared to regular aquatic plants (or other algae, for that matter). Conversely, I almost shudder to think what the 02 profile of my pond would be pre-dawn without an aeration system! -- Mike
