cool post Bruce. my (aquatic) vegetation has shown die off as well, but i dont think its because of cooler temps as much as change in sun angle (south side of pond is bordered by medium heavy timber, so pond gets less light as we move towards fall). fortunately my Gams and GSF could care less what the O2 does, but after I get some other species in there, i'll have to pay closer attention.

GSF are people too!