WOOO HOOO!!! I've got SPONGES!! Just checked the pipe this morning, first there has been a slime happily growing and getting thicker for a month or so. Now I see small white sponges....I think. They look like small cotton balls with a spiky thing at the tip. I assume this is the mouth. Any way, I haven't tested in a week or so, so I will give results tonight after I get time to test.
My
nitrates have been holding at 5 or less, so maybe they will hit 0 today!!