Here are some pictures of our pond (hope I post this right...) After having huge algae blooms last year, killing all our fish and finally being able to enjoy it... in the last few days we have this massive amount of black growth on the spillway and some of the other waterfall rocks. What is it?? Water is not as clear as I'd like it... but we are trying barley pellets this year (algae was a problem last year but we put this in hoping to prevent a problem) so I assumed the lack of clarity was from the pellets.
We did just have about 2" of rain, so I'm wondering if that could have caused the discoloration and the black scum on the spillway. We have a rubber lining covered with 1" gravel and we have a rock based wall (with rock caverns for the fish). Estimated to be 800-1000 gallons. We have an EasyPro mini skimmer, EasyPro pump that is plenty big for that size, and EasyPro biofalls. Just this year we have added some filter material - the installers only used this plastic mesh thing that stopped larger things passing through the pump. I think we need to add considerable filtration materials, but am still researching. We have 2 koi (of unknown kind), 2 comets and 1 shobunkin. We also have a resident frog named Fred. I haven't named this fish again since my fiasco last year :/
Not sure how to make the photos paste in... so here is a link
http://picasaweb.google.com/mmerry19/Pond2010#